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Expand the Nimrod loader to include Tables 1, 3 & 4#6763

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ESadek-MO merged 13 commits into
SciTools:mainfrom
HGWright:nimrod_tables
Feb 9, 2026
Merged

Expand the Nimrod loader to include Tables 1, 3 & 4#6763
ESadek-MO merged 13 commits into
SciTools:mainfrom
HGWright:nimrod_tables

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@HGWright

@HGWright HGWright commented Oct 24, 2025

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🚀 Pull Request

Description

This adds onto the existing code, and seperates things between Table 1 and Table 2 that was always treated as default before.

Table 1 is now the default and Tables 2, 3 and 4 can be accessed when certain conditions are met.


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  • benchmark_this Request that this pull request be benchmarked to check if it introduces performance shifts

@trexfeathers trexfeathers linked an issue Oct 28, 2025 that may be closed by this pull request
@trexfeathers trexfeathers marked this pull request as draft October 28, 2025 09:35

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Thanks @HGWright; here are some comments for you.

Comment thread lib/iris/fileformats/nimrod.py Outdated
Comment thread lib/iris/fileformats/nimrod.py
Comment thread lib/iris/fileformats/nimrod.py Outdated
Comment thread lib/iris/fileformats/nimrod_load_rules.py Outdated
Comment thread lib/iris/fileformats/nimrod.py Outdated
Comment thread lib/iris/fileformats/nimrod_load_rules.py
Comment thread lib/iris/fileformats/nimrod_load_rules.py Outdated
Comment thread lib/iris/fileformats/nimrod_load_rules.py Outdated
Comment thread lib/iris/fileformats/nimrod.py Outdated
Comment thread lib/iris/fileformats/nimrod.py
@codecov

codecov Bot commented Jan 20, 2026

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Codecov Report

❌ Patch coverage is 96.96970% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.20%. Comparing base (4141484) to head (c470b79).
⚠️ Report is 67 commits behind head on main.

Files with missing lines Patch % Lines
lib/iris/fileformats/nimrod_load_rules.py 95.45% 0 Missing and 2 partials ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main    #6763      +/-   ##
==========================================
- Coverage   90.43%   90.20%   -0.23%     
==========================================
  Files          91       91              
  Lines       24839    24885      +46     
  Branches     4656     4672      +16     
==========================================
- Hits        22463    22448      -15     
- Misses       1608     1667      +59     
- Partials      768      770       +2     

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@HGWright HGWright changed the title (WIP) Expand the Nimrod loader to include Table 1 Expand the Nimrod loader to include Table 1 Feb 3, 2026
@HGWright HGWright marked this pull request as ready for review February 3, 2026 09:15
@HGWright HGWright changed the title Expand the Nimrod loader to include Table 1 Expand the Nimrod loader to include Tables 1, 3 & 4 Feb 4, 2026
@HGWright HGWright added the benchmark_this Request that this pull request be benchmarked to check if it introduces performance shifts label Feb 4, 2026
@github-actions

github-actions Bot commented Feb 4, 2026

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⏱️ Performance Benchmark Report: 6047a02

Performance shifts
| Change   | Before [850a7845]    | After [6047a028]    |   Ratio | Benchmark (Parameter)                    |
|----------|----------------------|---------------------|---------|------------------------------------------|
| +        | 133±1μs              | 173±4μs             |     1.3 | import_iris.Iris.time_fileformats_nimrod |
Full benchmark results

Benchmarks that have stayed the same:

| Change   | Before [850a7845]    | After [6047a028]    | Ratio   | Benchmark (Parameter)                                                                       |
|----------|----------------------|---------------------|---------|---------------------------------------------------------------------------------------------|
|          | 21.3±0.3ms           | 21.1±0.2ms          | 0.99    | aggregate_collapse.Aggregation.time_aggregated_by_COUNT(False)                              |
|          | 57.6±0.7ms           | 57.9±1ms            | 1.00    | aggregate_collapse.Aggregation.time_aggregated_by_COUNT(True)                               |
|          | 36.1±0.3ms           | 35.8±1ms            | 0.99    | aggregate_collapse.Aggregation.time_aggregated_by_FAST_PERCENTILE(False)                    |
|          | 206±4ms              | 209±5ms             | 1.01    | aggregate_collapse.Aggregation.time_aggregated_by_FAST_PERCENTILE(True)                     |
|          | 23.3±0.4ms           | 23.4±0.6ms          | 1.01    | aggregate_collapse.Aggregation.time_aggregated_by_GMEAN(False)                              |
|          | 35.9±0.4ms           | 36.0±0.8ms          | 1.00    | aggregate_collapse.Aggregation.time_aggregated_by_GMEAN(True)                               |
|          | 23.5±0.4ms           | 23.8±0.3ms          | 1.01    | aggregate_collapse.Aggregation.time_aggregated_by_HMEAN(False)                              |
|          | 36.7±1ms             | 36.5±0.8ms          | 0.99    | aggregate_collapse.Aggregation.time_aggregated_by_HMEAN(True)                               |
|          | 21.1±0.4ms           | 21.3±0.5ms          | 1.01    | aggregate_collapse.Aggregation.time_aggregated_by_MAX(False)                                |
|          | 49.1±1ms             | 49.3±1ms            | 1.00    | aggregate_collapse.Aggregation.time_aggregated_by_MAX(True)                                 |
|          | 138±3ms              | 141±4ms             | 1.02    | aggregate_collapse.Aggregation.time_aggregated_by_MAX_RUN(False)                            |
|          | 142±2ms              | 143±3ms             | 1.01    | aggregate_collapse.Aggregation.time_aggregated_by_MAX_RUN(True)                             |
|          | 22.3±0.4ms           | 22.4±0.4ms          | 1.01    | aggregate_collapse.Aggregation.time_aggregated_by_MEAN(False)                               |
|          | 51.8±1ms             | 53.2±2ms            | 1.03    | aggregate_collapse.Aggregation.time_aggregated_by_MEAN(True)                                |
|          | 23.8±0.4ms           | 23.8±0.4ms          | 1.00    | aggregate_collapse.Aggregation.time_aggregated_by_MEDIAN(False)                             |
|          | 62.6±0.8ms           | 63.6±1ms            | 1.02    | aggregate_collapse.Aggregation.time_aggregated_by_MEDIAN(True)                              |
|          | 21.3±0.4ms           | 21.2±0.7ms          | 0.99    | aggregate_collapse.Aggregation.time_aggregated_by_MIN(False)                                |
|          | 47.8±1ms             | 49.4±1ms            | 1.03    | aggregate_collapse.Aggregation.time_aggregated_by_MIN(True)                                 |
|          | 1.10±0.01s           | 1.09±0.01s          | 1.00    | aggregate_collapse.Aggregation.time_aggregated_by_PEAK(False)                               |
|          | 1.10±0.01s           | 1.10±0.02s          | 1.00    | aggregate_collapse.Aggregation.time_aggregated_by_PEAK(True)                                |
|          | 229±1ms              | 225±2ms             | 0.98    | aggregate_collapse.Aggregation.time_aggregated_by_PERCENTILE(False)                         |
|          | 408±10ms             | 407±9ms             | 1.00    | aggregate_collapse.Aggregation.time_aggregated_by_PERCENTILE(True)                          |
|          | 22.1±0.2ms           | 22.5±0.6ms          | 1.02    | aggregate_collapse.Aggregation.time_aggregated_by_PROPORTION(False)                         |
|          | 35.0±0.8ms           | 34.7±0.7ms          | 0.99    | aggregate_collapse.Aggregation.time_aggregated_by_PROPORTION(True)                          |
|          | 22.5±0.3ms           | 22.3±0.2ms          | 0.99    | aggregate_collapse.Aggregation.time_aggregated_by_RMS(False)                                |
|          | 62.8±1ms             | 63.0±1ms            | 1.00    | aggregate_collapse.Aggregation.time_aggregated_by_RMS(True)                                 |
|          | 23.5±0.2ms           | 23.1±0.4ms          | 0.99    | aggregate_collapse.Aggregation.time_aggregated_by_STD_DEV(False)                            |
|          | 67.8±1ms             | 67.0±0.6ms          | 0.99    | aggregate_collapse.Aggregation.time_aggregated_by_STD_DEV(True)                             |
|          | 23.2±0.2ms           | 23.4±0.3ms          | 1.01    | aggregate_collapse.Aggregation.time_aggregated_by_VARIANCE(False)                           |
|          | 63.5±0.8ms           | 63.5±0.7ms          | 1.00    | aggregate_collapse.Aggregation.time_aggregated_by_VARIANCE(True)                            |
|          | 8.11±0.06ms          | 8.25±0.09ms         | 1.02    | aggregate_collapse.Aggregation.time_collapsed_by_COUNT(False)                               |
|          | 25.5±0.7ms           | 25.9±0.6ms          | 1.01    | aggregate_collapse.Aggregation.time_collapsed_by_COUNT(True)                                |
|          | 20.5±0.3ms           | 21.2±0.3ms          | 1.03    | aggregate_collapse.Aggregation.time_collapsed_by_FAST_PERCENTILE(False)                     |
|          | 161±6ms              | 167±3ms             | 1.03    | aggregate_collapse.Aggregation.time_collapsed_by_FAST_PERCENTILE(True)                      |
|          | 8.57±0.07ms          | 8.76±0.2ms          | 1.02    | aggregate_collapse.Aggregation.time_collapsed_by_GMEAN(False)                               |
|          | 24.0±0.3ms           | 23.6±0.4ms          | 0.98    | aggregate_collapse.Aggregation.time_collapsed_by_GMEAN(True)                                |
|          | 8.45±0.4ms           | 8.64±0.2ms          | 1.02    | aggregate_collapse.Aggregation.time_collapsed_by_HMEAN(False)                               |
|          | 23.7±0.7ms           | 24.3±0.7ms          | 1.02    | aggregate_collapse.Aggregation.time_collapsed_by_HMEAN(True)                                |
|          | 7.96±0.1ms           | 8.18±0.2ms          | 1.03    | aggregate_collapse.Aggregation.time_collapsed_by_MAX(False)                                 |
|          | 24.1±0.6ms           | 24.6±0.4ms          | 1.02    | aggregate_collapse.Aggregation.time_collapsed_by_MAX(True)                                  |
|          | 25.5±0.3ms           | 25.5±0.3ms          | 1.00    | aggregate_collapse.Aggregation.time_collapsed_by_MAX_RUN(False)                             |
|          | 39.5±0.7ms           | 39.5±0.9ms          | 1.00    | aggregate_collapse.Aggregation.time_collapsed_by_MAX_RUN(True)                              |
|          | 8.32±0.2ms           | 8.47±0.2ms          | 1.02    | aggregate_collapse.Aggregation.time_collapsed_by_MEAN(False)                                |
|          | 24.8±0.9ms           | 24.6±0.4ms          | 0.99    | aggregate_collapse.Aggregation.time_collapsed_by_MEAN(True)                                 |
|          | 9.32±0.05ms          | 9.51±0.2ms          | 1.02    | aggregate_collapse.Aggregation.time_collapsed_by_MEDIAN(False)                              |
|          | 27.0±2ms             | 27.1±0.4ms          | 1.00    | aggregate_collapse.Aggregation.time_collapsed_by_MEDIAN(True)                               |
|          | 8.02±0.03ms          | 8.12±0.1ms          | 1.01    | aggregate_collapse.Aggregation.time_collapsed_by_MIN(False)                                 |
|          | 24.0±0.6ms           | 24.5±0.7ms          | 1.02    | aggregate_collapse.Aggregation.time_collapsed_by_MIN(True)                                  |
|          | 539±4ms              | 536±5ms             | 1.00    | aggregate_collapse.Aggregation.time_collapsed_by_PEAK(False)                                |
|          | 552±4ms              | 549±6ms             | 0.99    | aggregate_collapse.Aggregation.time_collapsed_by_PEAK(True)                                 |
|          | 48.8±0.7ms           | 49.3±0.6ms          | 1.01    | aggregate_collapse.Aggregation.time_collapsed_by_PERCENTILE(False)                          |
|          | 173±4ms              | 177±3ms             | 1.02    | aggregate_collapse.Aggregation.time_collapsed_by_PERCENTILE(True)                           |
|          | 8.34±0.09ms          | 8.36±0.1ms          | 1.00    | aggregate_collapse.Aggregation.time_collapsed_by_PROPORTION(False)                          |
|          | 23.7±0.4ms           | 23.5±0.4ms          | 0.99    | aggregate_collapse.Aggregation.time_collapsed_by_PROPORTION(True)                           |
|          | 8.34±0.07ms          | 8.65±0.1ms          | 1.04    | aggregate_collapse.Aggregation.time_collapsed_by_RMS(False)                                 |
|          | 26.1±2ms             | 26.7±0.4ms          | 1.02    | aggregate_collapse.Aggregation.time_collapsed_by_RMS(True)                                  |
|          | 8.44±0.2ms           | 8.83±0.2ms          | 1.05    | aggregate_collapse.Aggregation.time_collapsed_by_STD_DEV(False)                             |
|          | 25.7±0.5ms           | 26.6±0.7ms          | 1.04    | aggregate_collapse.Aggregation.time_collapsed_by_STD_DEV(True)                              |
|          | 8.59±0.1ms           | 8.84±0.1ms          | 1.03    | aggregate_collapse.Aggregation.time_collapsed_by_VARIANCE(False)                            |
|          | 25.2±0.6ms           | 25.7±0.4ms          | 1.02    | aggregate_collapse.Aggregation.time_collapsed_by_VARIANCE(True)                             |
|          | 22.6±0.6ms           | 23.4±0.5ms          | 1.03    | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_MEAN(False)                     |
|          | 89.4±1ms             | 90.9±1ms            | 1.02    | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_MEAN(True)                      |
|          | 22.9±0.2ms           | 23.3±0.3ms          | 1.01    | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_RMS(False)                      |
|          | 102±3ms              | 103±2ms             | 1.01    | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_RMS(True)                       |
|          | 21.6±0.4ms           | 21.9±0.3ms          | 1.01    | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_SUM(False)                      |
|          | 58.8±1ms             | 59.6±2ms            | 1.01    | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_SUM(True)                       |
|          | 8.80±0.1ms           | 8.81±0.1ms          | 1.00    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_MEAN(False)                      |
|          | 31.0±0.7ms           | 31.6±0.5ms          | 1.02    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_MEAN(True)                       |
|          | 8.48±0.1ms           | 8.83±0.08ms         | 1.04    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_RMS(False)                       |
|          | 32.6±0.9ms           | 33.4±0.6ms          | 1.03    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_RMS(True)                        |
|          | 8.30±0.08ms          | 8.46±0.1ms          | 1.02    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_SUM(False)                       |
|          | 26.0±1ms             | 26.6±0.3ms          | 1.02    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_SUM(True)                        |
|          | 232±1ms              | 233±3ms             | 1.01    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_WPERCENTILE(False)               |
|          | 326±5ms              | 332±4ms             | 1.02    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_WPERCENTILE(True)                |
|          | 1.17±0.01ms          | 1.18±0.02ms         | 1.01    | cube.CubeCreation.time_create(False, 'construct')                                           |
|          | 404±4μs              | 408±5μs             | 1.01    | cube.CubeCreation.time_create(False, 'instantiate')                                         |
|          | 2.07±0.02ms          | 2.06±0.02ms         | 1.00    | cube.CubeCreation.time_create(True, 'construct')                                            |
|          | 1.47±0.01ms          | 1.48±0.01ms         | 1.01    | cube.CubeCreation.time_create(True, 'instantiate')                                          |
|          | 87.0±2ms             | 85.7±1ms            | 0.99    | cube.CubeEquality.time_equality(False, False, 'all_equal')                                  |
|          | 25.8±0.8ms           | 25.8±1ms            | 1.00    | cube.CubeEquality.time_equality(False, False, 'coord_inequality')                           |
|          | 100±7ms              | 99.2±0.7ms          | 0.99    | cube.CubeEquality.time_equality(False, False, 'data_inequality')                            |
|          | 17.9±0.4μs           | 17.8±0.2μs          | 0.99    | cube.CubeEquality.time_equality(False, False, 'metadata_inequality')                        |
|          | 91.2±3ms             | 90.1±3ms            | 0.99    | cube.CubeEquality.time_equality(False, True, 'all_equal')                                   |
|          | 31.2±2ms             | 29.4±1ms            | 0.94    | cube.CubeEquality.time_equality(False, True, 'coord_inequality')                            |
|          | 105±3ms              | 105±4ms             | 1.00    | cube.CubeEquality.time_equality(False, True, 'data_inequality')                             |
|          | 17.7±0.4μs           | 17.8±0.4μs          | 1.00    | cube.CubeEquality.time_equality(False, True, 'metadata_inequality')                         |
|          | 200±4ms              | 205±1ms             | 1.02    | cube.CubeEquality.time_equality(True, False, 'all_equal')                                   |
|          | 87.0±6ms             | 89.1±1ms            | 1.02    | cube.CubeEquality.time_equality(True, False, 'coord_inequality')                            |
|          | 227±5ms              | 233±3ms             | 1.03    | cube.CubeEquality.time_equality(True, False, 'data_inequality')                             |
|          | 57.1±1μs             | 56.1±2μs            | 0.98    | cube.CubeEquality.time_equality(True, False, 'metadata_inequality')                         |
|          | 305±5ms              | 310±7ms             | 1.02    | cube.CubeEquality.time_equality(True, True, 'all_equal')                                    |
|          | 189±3ms              | 194±3ms             | 1.03    | cube.CubeEquality.time_equality(True, True, 'coord_inequality')                             |
|          | 332±30ms             | 341±5ms             | 1.03    | cube.CubeEquality.time_equality(True, True, 'data_inequality')                              |
|          | 381±6μs              | 385±5μs             | 1.01    | cube.CubeEquality.time_equality(True, True, 'metadata_inequality')                          |
|          | 985±7μs              | 1.02±0.01ms         | 1.03    | import_iris.Iris.time__concatenate                                                          |
|          | 226±0.9μs            | 234±4μs             | 1.04    | import_iris.Iris.time__constraints                                                          |
|          | 139±1μs              | 140±2μs             | 1.01    | import_iris.Iris.time__data_manager                                                         |
|          | 101±0.7μs            | 100±0.8μs           | 0.99    | import_iris.Iris.time__deprecation                                                          |
|          | 176±0.7μs            | 175±0.8μs           | 0.99    | import_iris.Iris.time__lazy_data                                                            |
|          | 1.09±0.01ms          | 1.10±0.01ms         | 1.01    | import_iris.Iris.time__merge                                                                |
|          | 76.2±0.5μs           | 75.0±0.8μs          | 0.98    | import_iris.Iris.time__representation                                                       |
|          | 725±8μs              | 738±10μs            | 1.02    | import_iris.Iris.time_analysis                                                              |
|          | 154±1μs              | 152±0.6μs           | 0.99    | import_iris.Iris.time_analysis__area_weighted                                               |
|          | 108±1μs              | 108±1μs             | 1.00    | import_iris.Iris.time_analysis__grid_angles                                                 |
|          | 284±2μs              | 286±6μs             | 1.01    | import_iris.Iris.time_analysis__interpolation                                               |
|          | 220±7μs              | 218±0.8μs           | 0.99    | import_iris.Iris.time_analysis__regrid                                                      |
|          | 130±3μs              | 128±2μs             | 0.99    | import_iris.Iris.time_analysis__scipy_interpolate                                           |
|          | 137±3μs              | 134±2μs             | 0.97    | import_iris.Iris.time_analysis_calculus                                                     |
|          | 356±5μs              | 357±3μs             | 1.00    | import_iris.Iris.time_analysis_cartography                                                  |
|          | 93.4±2μs             | 93.2±2μs            | 1.00    | import_iris.Iris.time_analysis_geomerty                                                     |
|          | 229±10μs             | 229±3μs             | 1.00    | import_iris.Iris.time_analysis_maths                                                        |
|          | 96.3±0.3μs           | 94.4±1μs            | 0.98    | import_iris.Iris.time_analysis_stats                                                        |
|          | 195±4μs              | 200±1μs             | 1.03    | import_iris.Iris.time_analysis_trajectory                                                   |
|          | 397±20μs             | 395±4μs             | 1.00    | import_iris.Iris.time_aux_factory                                                           |
|          | 82.7±0.5μs           | 80.5±1μs            | 0.97    | import_iris.Iris.time_common                                                                |
|          | 194±4μs              | 194±4μs             | 1.00    | import_iris.Iris.time_common_lenient                                                        |
|          | 1.58±0.02ms          | 1.61±0.02ms         | 1.02    | import_iris.Iris.time_common_metadata                                                       |
|          | 205±3μs              | 208±2μs             | 1.01    | import_iris.Iris.time_common_mixin                                                          |
|          | 1.31±0.01ms          | 1.30±0.02ms         | 0.99    | import_iris.Iris.time_common_resolve                                                        |
|          | 223±1μs              | 226±1μs             | 1.01    | import_iris.Iris.time_config                                                                |
|          | 137±4μs              | 134±1μs             | 0.98    | import_iris.Iris.time_coord_categorisation                                                  |
|          | 462±6μs              | 470±6μs             | 1.02    | import_iris.Iris.time_coord_systems                                                         |
|          | 917±20μs             | 927±20μs            | 1.01    | import_iris.Iris.time_coords                                                                |
|          | 911±6μs              | 923±10μs            | 1.01    | import_iris.Iris.time_cube                                                                  |
|          | 289±2μs              | 296±7μs             | 1.02    | import_iris.Iris.time_exceptions                                                            |
|          | 76.0±0.4μs           | 74.5±0.7μs          | 0.98    | import_iris.Iris.time_experimental                                                          |
|          | 182±5μs              | 181±1μs             | 1.00    | import_iris.Iris.time_fileformats                                                           |
|          | 296±3μs              | 303±7μs             | 1.02    | import_iris.Iris.time_fileformats__ff                                                       |
|          | 2.70±0.05ms          | 2.73±0.5ms          | 1.01    | import_iris.Iris.time_fileformats__ff_cross_references                                      |
|          | 76.6±0.3μs           | 76.6±0.5μs          | 1.00    | import_iris.Iris.time_fileformats__pp_lbproc_pairs                                          |
|          | 126±4μs              | 128±2μs             | 1.01    | import_iris.Iris.time_fileformats_abf                                                       |
|          | 553±6μs              | 552±10μs            | 1.00    | import_iris.Iris.time_fileformats_cf                                                        |
|          | 4.93±0.3ms           | 5.35±0.3ms          | 1.08    | import_iris.Iris.time_fileformats_dot                                                       |
|          | 72.2±0.4μs           | 73.1±0.7μs          | 1.01    | import_iris.Iris.time_fileformats_name                                                      |
|          | 270±3μs              | 270±3μs             | 1.00    | import_iris.Iris.time_fileformats_name_loaders                                              |
|          | 118±2μs              | 118±2μs             | 1.00    | import_iris.Iris.time_fileformats_netcdf                                                    |
|          | 214±4μs              | 228±6μs             | 1.06    | import_iris.Iris.time_fileformats_nimrod_load_rules                                         |
|          | 911±7μs              | 939±20μs            | 1.03    | import_iris.Iris.time_fileformats_pp                                                        |
|          | 182±2μs              | 187±3μs             | 1.03    | import_iris.Iris.time_fileformats_pp_load_rules                                             |
|          | 139±2μs              | 135±2μs             | 0.97    | import_iris.Iris.time_fileformats_pp_save_rules                                             |
|          | 629±9μs              | 619±7μs             | 0.98    | import_iris.Iris.time_fileformats_rules                                                     |
|          | 255±6μs              | 260±2μs             | 1.02    | import_iris.Iris.time_fileformats_structured_array_identification                           |
|          | 83.3±2μs             | 80.8±0.8μs          | 0.97    | import_iris.Iris.time_fileformats_um                                                        |
|          | 173±3μs              | 174±2μs             | 1.01    | import_iris.Iris.time_fileformats_um__fast_load                                             |
|          | 158±1μs              | 161±2μs             | 1.02    | import_iris.Iris.time_fileformats_um__fast_load_structured_fields                           |
|          | 73.5±0.1μs           | 72.4±0.6μs          | 0.98    | import_iris.Iris.time_fileformats_um__ff_replacement                                        |
|          | 80.1±0.5μs           | 79.2±0.6μs          | 0.99    | import_iris.Iris.time_fileformats_um__optimal_array_structuring                             |
|          | 991±10μs             | 1.01±0.02ms         | 1.02    | import_iris.Iris.time_fileformats_um_cf_map                                                 |
|          | 150±1μs              | 145±1μs             | 0.96    | import_iris.Iris.time_io                                                                    |
|          | 215±2μs              | 217±2μs             | 1.01    | import_iris.Iris.time_io_format_picker                                                      |
|          | 221±2μs              | 222±2μs             | 1.01    | import_iris.Iris.time_iris                                                                  |
|          | 143±2μs              | 142±1μs             | 0.99    | import_iris.Iris.time_iterate                                                               |
|          | 8.42±0.1ms           | 8.56±0.06ms         | 1.02    | import_iris.Iris.time_palette                                                               |
|          | 1.79±0.01ms          | 1.87±0.05ms         | 1.04    | import_iris.Iris.time_plot                                                                  |
|          | 233±5μs              | 235±1μs             | 1.01    | import_iris.Iris.time_quickplot                                                             |
|          | 2.13±0.1ms           | 2.41±0.3ms          | 1.13    | import_iris.Iris.time_std_names                                                             |
|          | 1.87±0.01ms          | 1.88±0.01ms         | 1.00    | import_iris.Iris.time_symbols                                                               |
|          | 42.3±2ms             | 41.7±0.8ms          | 0.98    | import_iris.Iris.time_tests                                                                 |
|          | 240±1μs              | 237±3μs             | 0.99    | import_iris.Iris.time_third_party_cartopy                                                   |
|          | 5.45±0.4ms           | 5.38±0.2ms          | 0.99    | import_iris.Iris.time_third_party_cf_units                                                  |
|          | 122±0.6μs            | 122±1μs             | 1.00    | import_iris.Iris.time_third_party_cftime                                                    |
|          | 2.71±0.02ms          | 2.77±0.08ms         | 1.02    | import_iris.Iris.time_third_party_matplotlib                                                |
|          | 559±3μs              | 567±6μs             | 1.02    | import_iris.Iris.time_third_party_numpy                                                     |
|          | 173±4μs              | 174±3μs             | 1.01    | import_iris.Iris.time_third_party_scipy                                                     |
|          | 117±1μs              | 114±0.7μs           | 0.97    | import_iris.Iris.time_time                                                                  |
|          | 880±10μs             | 891±10μs            | 1.01    | import_iris.Iris.time_util                                                                  |
|          | 98.3±2μs             | 98.1±0.5μs          | 1.00    | iterate.IZip.time_izip                                                                      |
|          | 10.5±0.1ms           | 10.8±0.5ms          | 1.03    | load.LoadAndRealise.time_load((1280, 960, 5), False, 'FF')                                  |
|          | 19.8±0.6ms           | 21.6±0.2ms          | 1.09    | load.LoadAndRealise.time_load((1280, 960, 5), False, 'NetCDF')                              |
|          | 10.3±0.1ms           | 10.7±0.3ms          | 1.04    | load.LoadAndRealise.time_load((1280, 960, 5), False, 'PP')                                  |
|          | 10.1±0.07ms          | 10.7±0.3ms          | 1.06    | load.LoadAndRealise.time_load((1280, 960, 5), True, 'FF')                                   |
|          | 16.5±0.3ms           | 17.9±0.3ms          | 1.09    | load.LoadAndRealise.time_load((1280, 960, 5), True, 'NetCDF')                               |
|          | 10.2±0.09ms          | 10.7±0.3ms          | 1.05    | load.LoadAndRealise.time_load((1280, 960, 5), True, 'PP')                                   |
|          | 1.58±0.01s           | 1.61±0.02s          | 1.02    | load.LoadAndRealise.time_load((2, 2, 1000), False, 'FF')                                    |
|          | 15.7±0.6ms           | 16.9±0.6ms          | 1.07    | load.LoadAndRealise.time_load((2, 2, 1000), False, 'NetCDF')                                |
|          | 1.60±0.02s           | 1.62±0.01s          | 1.01    | load.LoadAndRealise.time_load((2, 2, 1000), False, 'PP')                                    |
|          | 1.59±0.01s           | 1.60±0.02s          | 1.00    | load.LoadAndRealise.time_load((2, 2, 1000), True, 'FF')                                     |
|          | 15.5±0.4ms           | 16.7±0.7ms          | 1.08    | load.LoadAndRealise.time_load((2, 2, 1000), True, 'NetCDF')                                 |
|          | 1.60±0.01s           | 1.63±0.03s          | 1.02    | load.LoadAndRealise.time_load((2, 2, 1000), True, 'PP')                                     |
|          | 5.42±0.05ms          | 5.73±0.3ms          | 1.06    | load.LoadAndRealise.time_load((50, 50, 2), False, 'FF')                                     |
|          | 15.5±0.2ms           | 16.5±0.6ms          | 1.07    | load.LoadAndRealise.time_load((50, 50, 2), False, 'NetCDF')                                 |
|          | 5.24±0.06ms          | 5.52±0.2ms          | 1.05    | load.LoadAndRealise.time_load((50, 50, 2), False, 'PP')                                     |
|          | 5.31±0.02ms          | 5.60±0.1ms          | 1.05    | load.LoadAndRealise.time_load((50, 50, 2), True, 'FF')                                      |
|          | 15.3±0.3ms           | 16.6±0.4ms          | 1.09    | load.LoadAndRealise.time_load((50, 50, 2), True, 'NetCDF')                                  |
|          | 5.33±0.06ms          | 5.36±0.07ms         | 1.01    | load.LoadAndRealise.time_load((50, 50, 2), True, 'PP')                                      |
|          | 24.1±2ms             | 29.7±3ms            | ~1.23   | load.LoadAndRealise.time_realise((1280, 960, 5), False, 'FF')                               |
|          | 27.2±0.8ms           | 27.6±2ms            | 1.01    | load.LoadAndRealise.time_realise((1280, 960, 5), False, 'NetCDF')                           |
|          | 12.6±0.9ms           | 13.6±2ms            | 1.07    | load.LoadAndRealise.time_realise((1280, 960, 5), False, 'PP')                               |
|          | 29.4±1ms             | 29.4±1ms            | 1.00    | load.LoadAndRealise.time_realise((1280, 960, 5), True, 'FF')                                |
|          | 96.5±2ms             | 99.5±2ms            | 1.03    | load.LoadAndRealise.time_realise((1280, 960, 5), True, 'NetCDF')                            |
|          | 28.9±0.9ms           | 28.9±1ms            | 1.00    | load.LoadAndRealise.time_realise((1280, 960, 5), True, 'PP')                                |
|          | 639±6ms              | 639±4ms             | 1.00    | load.LoadAndRealise.time_realise((2, 2, 1000), False, 'FF')                                 |
|          | 6.49±0.8ms           | 6.51±0.2ms          | 1.00    | load.LoadAndRealise.time_realise((2, 2, 1000), False, 'NetCDF')                             |
|          | 641±5ms              | 640±7ms             | 1.00    | load.LoadAndRealise.time_realise((2, 2, 1000), False, 'PP')                                 |
|          | 657±7ms              | 652±9ms             | 0.99    | load.LoadAndRealise.time_realise((2, 2, 1000), True, 'FF')                                  |
|          | 6.71±0.4ms           | 6.58±0.1ms          | 0.98    | load.LoadAndRealise.time_realise((2, 2, 1000), True, 'NetCDF')                              |
|          | 655±5ms              | 648±9ms             | 0.99    | load.LoadAndRealise.time_realise((2, 2, 1000), True, 'PP')                                  |
|          | 2.29±0.1ms           | 2.42±0.06ms         | 1.06    | load.LoadAndRealise.time_realise((50, 50, 2), False, 'FF')                                  |
|          | 6.36±0.1ms           | 6.81±0.3ms          | 1.07    | load.LoadAndRealise.time_realise((50, 50, 2), False, 'NetCDF')                              |
|          | 2.22±0.09ms          | 2.40±0.06ms         | 1.08    | load.LoadAndRealise.time_realise((50, 50, 2), False, 'PP')                                  |
|          | 2.24±0.09ms          | 2.45±0.09ms         | 1.09    | load.LoadAndRealise.time_realise((50, 50, 2), True, 'FF')                                   |
|          | 6.38±0.03ms          | 6.91±0.3ms          | 1.08    | load.LoadAndRealise.time_realise((50, 50, 2), True, 'NetCDF')                               |
|          | 2.22±0.05ms          | 2.35±0.06ms         | 1.06    | load.LoadAndRealise.time_realise((50, 50, 2), True, 'PP')                                   |
|          | 368±4ms              | 365±9ms             | 0.99    | load.ManyCubes.time_many_cube_load                                                          |
|          | 97.2±1ms             | 96.4±0.7ms          | 0.99    | load.ManyVars.time_many_var_load                                                            |
|          | 10.8±0.2ms           | 10.7±0.1ms          | 0.98    | load.STASHConstraint.time_stash_constraint((1280, 960, 5), 'FF')                            |
|          | 10.7±0.1ms           | 10.7±0.2ms          | 1.01    | load.STASHConstraint.time_stash_constraint((1280, 960, 5), 'PP')                            |
|          | 1.61±0.01s           | 1.63±0.02s          | 1.01    | load.STASHConstraint.time_stash_constraint((2, 2, 1000), 'FF')                              |
|          | 1.60±0.02s           | 1.63±0.02s          | 1.02    | load.STASHConstraint.time_stash_constraint((2, 2, 1000), 'PP')                              |
|          | 5.53±0.09ms          | 5.56±0.1ms          | 1.01    | load.STASHConstraint.time_stash_constraint((2, 2, 2), 'FF')                                 |
|          | 5.35±0.04ms          | 5.67±0.09ms         | 1.06    | load.STASHConstraint.time_stash_constraint((2, 2, 2), 'PP')                                 |
|          | 9.60±0.3ms           | 9.67±0.2ms          | 1.01    | load.StructuredFF.time_structured_load((1280, 960, 5), False)                               |
|          | 5.88±0.3ms           | 5.97±0.1ms          | 1.01    | load.StructuredFF.time_structured_load((1280, 960, 5), True)                                |
|          | 1.56±0.03s           | 1.59±0.02s          | 1.02    | load.StructuredFF.time_structured_load((2, 2, 1000), False)                                 |
|          | 453±6ms              | 449±8ms             | 0.99    | load.StructuredFF.time_structured_load((2, 2, 1000), True)                                  |
|          | 4.50±0.07ms          | 4.62±0.06ms         | 1.03    | load.StructuredFF.time_structured_load((2, 2, 2), False)                                    |
|          | 4.45±0.1ms           | 4.54±0.05ms         | 1.02    | load.StructuredFF.time_structured_load((2, 2, 2), True)                                     |
|          | 164±1ms              | 165±3ms             | 1.01    | load.TimeConstraint.time_time_constraint(20, 'FF')                                          |
|          | 19.0±0.6ms           | 19.3±0.3ms          | 1.01    | load.TimeConstraint.time_time_constraint(20, 'NetCDF')                                      |
|          | 167±2ms              | 165±2ms             | 0.99    | load.TimeConstraint.time_time_constraint(20, 'PP')                                          |
|          | 33.3±0.6ms           | 34.2±0.8ms          | 1.03    | load.TimeConstraint.time_time_constraint(3, 'FF')                                           |
|          | 18.9±0.1ms           | 18.9±0.3ms          | 1.00    | load.TimeConstraint.time_time_constraint(3, 'NetCDF')                                       |
|          | 33.4±0.2ms           | 33.8±0.2ms          | 1.01    | load.TimeConstraint.time_time_constraint(3, 'PP')                                           |
|          | 24.0±2ms             | 25.1±0.6ms          | 1.04    | load.ugrid.BasicLoading.time_load_file(1)                                                   |
|          | 58.2±1ms             | 61.1±2ms            | 1.05    | load.ugrid.BasicLoading.time_load_file(200000)                                              |
|          | 12.1±0.6ms           | 13.5±0.5ms          | 1.12    | load.ugrid.BasicLoading.time_load_mesh(1)                                                   |
|          | 24.0±0.4ms           | 24.3±0.8ms          | 1.01    | load.ugrid.BasicLoading.time_load_mesh(200000)                                              |
|          | 23.6±0.9ms           | 24.9±0.9ms          | 1.05    | load.ugrid.BasicLoadingTime.time_load_file(1)                                               |
|          | 24.0±1ms             | 24.1±1ms            | 1.00    | load.ugrid.BasicLoadingTime.time_load_file(200000)                                          |
|          | 12.8±0.6ms           | 12.9±0.6ms          | 1.01    | load.ugrid.BasicLoadingTime.time_load_mesh(1)                                               |
|          | 15.9±0.8ms           | 16.8±0.5ms          | 1.06    | load.ugrid.BasicLoadingTime.time_load_mesh(200000)                                          |
|          | 25.4±1ms             | 26.7±0.9ms          | 1.05    | load.ugrid.Callback.time_load_file_callback(1)                                              |
|          | 71.3±2ms             | 72.2±2ms            | 1.01    | load.ugrid.Callback.time_load_file_callback(200000)                                         |
|          | 26.3±1ms             | 26.5±0.8ms          | 1.00    | load.ugrid.CallbackTime.time_load_file_callback(1)                                          |
|          | 27.7±1ms             | 28.4±0.8ms          | 1.03    | load.ugrid.CallbackTime.time_load_file_callback(200000)                                     |
|          | 6.44±0.2ms           | 6.64±0.4ms          | 1.03    | load.ugrid.DataRealisation.time_realise_data(10000)                                         |
|          | 9.42±0.2ms           | 9.61±0.2ms          | 1.02    | load.ugrid.DataRealisation.time_realise_data(200000)                                        |
|          | 45.3±2ms             | 46.0±0.7ms          | 1.02    | load.ugrid.DataRealisationTime.time_realise_data(10000)                                     |
|          | 800±30ms             | 791±7ms             | 0.99    | load.ugrid.DataRealisationTime.time_realise_data(200000)                                    |
|          | 1.41±0.06s           | 1.43±0.03s          | 1.01    | merge_concat.Concatenate.time_concatenate(False)                                            |
|          | 463±20ms             | 471±10ms            | 1.02    | merge_concat.Concatenate.time_concatenate(True)                                             |
|          | 2.43±0.01G           | 2.43±0.01G          | 1.00    | merge_concat.Concatenate.tracemalloc_concatenate(False)                                     |
|          | 121±10M              | 121±3M              | 1.00    | merge_concat.Concatenate.tracemalloc_concatenate(True)                                      |
|          | 36.7±4ms             | 35.7±1ms            | 0.97    | merge_concat.Merge.time_merge                                                               |
|          | 126±0.03M            | 126±0.03M           | 1.00    | merge_concat.Merge.tracemalloc_merge                                                        |
|          | 368±5ns              | 374±4ns             | 1.01    | mesh.utils.regions_combine.CombineRegionsComputeRealData.time_compute_data(50)              |
|          | 203±2ms              | 203±2ms             | 1.00    | mesh.utils.regions_combine.CombineRegionsComputeRealData.time_compute_data(500)             |
|          | 771±0.7k             | 771±0.6k            | 1.00    | mesh.utils.regions_combine.CombineRegionsComputeRealData.tracemalloc_compute_data(50)       |
|          | 60.2±0M              | 60.2±0M             | 1.00    | mesh.utils.regions_combine.CombineRegionsComputeRealData.tracemalloc_compute_data(500)      |
|          | 20.2±0.3ms           | 20.5±0.3ms          | 1.01    | mesh.utils.regions_combine.CombineRegionsCreateCube.time_create_combined_cube(50)           |
|          | 23.8±0.8ms           | 24.0±0.4ms          | 1.01    | mesh.utils.regions_combine.CombineRegionsCreateCube.time_create_combined_cube(500)          |
|          | 1.23±0M              | 1.23±0M             | 1.00    | mesh.utils.regions_combine.CombineRegionsCreateCube.tracemalloc_create_combined_cube(50)    |
|          | 25±0M                | 25±0M               | 1.00    | mesh.utils.regions_combine.CombineRegionsCreateCube.tracemalloc_create_combined_cube(500)   |
|          | 196±5ms              | 203±4ms             | 1.04    | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.time_stream_file2file(50)         |
|          | 675±7ms              | 689±3ms             | 1.02    | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.time_stream_file2file(500)        |
|          | 1.62±0.02M           | 1.6±0.05M           | 0.99    | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.tracemalloc_stream_file2file(50)  |
|          | 96.6±0.02M           | 96.7±0.03M          | 1.00    | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.tracemalloc_stream_file2file(500) |
|          | 137±2ms              | 138±0.9ms           | 1.01    | mesh.utils.regions_combine.CombineRegionsSaveData.time_save(50)                             |
|          | 610±8ms              | 610±7ms             | 1.00    | mesh.utils.regions_combine.CombineRegionsSaveData.time_save(500)                            |
|          | 1.5±0.03M            | 1.51±0.03M          | 1.00    | mesh.utils.regions_combine.CombineRegionsSaveData.tracemalloc_save(50)                      |
|          | 96.5±0.03M           | 96.5±0.03M          | 1.00    | mesh.utils.regions_combine.CombineRegionsSaveData.tracemalloc_save(500)                     |
|          | 2.1752849999999997   | 2.1752849999999997  | 1.00    | mesh.utils.regions_combine.CombineRegionsSaveData.track_filesize_saved(50)                  |
|          | 216.01528499999998   | 216.01528499999998  | 1.00    | mesh.utils.regions_combine.CombineRegionsSaveData.track_filesize_saved(500)                 |
|          | 6.99±0.09ms          | 7.26±0.08ms         | 1.04    | plot.AuxSort.time_aux_sort                                                                  |
|          | 82.6±4ms             | 86.2±3ms            | 1.04    | regridding.CurvilinearRegridding.time_regrid_pic                                            |
|          | 136±3M               | 136±3M              | 1.00    | regridding.CurvilinearRegridding.tracemalloc_regrid_pic                                     |
|          | 105±7ms              | 115±7ms             | 1.09    | regridding.HorizontalChunkedRegridding.time_regrid_area_w                                   |
|          | 67.9±2ms             | 69.3±0.8ms          | 1.02    | regridding.HorizontalChunkedRegridding.time_regrid_area_w_new_grid                          |
|          | 107±0.3M             | 107±0.2M            | 1.00    | regridding.HorizontalChunkedRegridding.tracemalloc_regrid_area_w                            |
|          | 147±0.04M            | 147±0.04M           | 1.00    | regridding.HorizontalChunkedRegridding.tracemalloc_regrid_area_w_new_grid                   |
|          | 7.91±0.5ms           | 8.56±0.2ms          | 1.08    | save.NetcdfSave.time_netcdf_save_cube(50, False)                                            |
|          | 137±2ms              | 143±1ms             | 1.04    | save.NetcdfSave.time_netcdf_save_cube(50, True)                                             |
|          | 46.0±2ms             | 47.5±0.6ms          | 1.03    | save.NetcdfSave.time_netcdf_save_cube(600, False)                                           |
|          | 543±10ms             | 545±9ms             | 1.00    | save.NetcdfSave.time_netcdf_save_cube(600, True)                                            |
|          | 91.6±0.3ns           | 90.6±2ns            | 0.99    | save.NetcdfSave.time_netcdf_save_mesh(50, False)                                            |
|          | 116±2ms              | 122±4ms             | 1.05    | save.NetcdfSave.time_netcdf_save_mesh(50, True)                                             |
|          | 92.5±1ns             | 96.2±3ns            | 1.04    | save.NetcdfSave.time_netcdf_save_mesh(600, False)                                           |
|          | 474±10ms             | 492±10ms            | 1.04    | save.NetcdfSave.time_netcdf_save_mesh(600, True)                                            |
|          | 30.6±0.5k            | 30.5±0.4k           | 1.00    | save.NetcdfSave.tracemalloc_netcdf_save(50, False)                                          |
|          | 1.88±0.2M            | 1.99±0.2M           | 1.06    | save.NetcdfSave.tracemalloc_netcdf_save(50, True)                                           |
|          | 30.6±0.4k            | 30.6±0.4k           | 1.00    | save.NetcdfSave.tracemalloc_netcdf_save(600, False)                                         |
|          | 225±30M              | 225±30M             | 1.00    | save.NetcdfSave.tracemalloc_netcdf_save(600, True)                                          |
|          | 40.8±0.4ms           | 41.9±0.9ms          | 1.03    | stats.PearsonR.time_lazy                                                                    |
|          | 9.81±0.3ms           | 10.6±0.3ms          | 1.08    | stats.PearsonR.time_real                                                                    |
|          | 30.6±1M              | 30.6±1M             | 1.00    | stats.PearsonR.tracemalloc_lazy                                                             |
|          | 18.3±0M              | 18.3±0.01M          | 1.00    | stats.PearsonR.tracemalloc_real                                                             |
|          | 28.4±1ms             | 30.7±1ms            | 1.08    | trajectory.TrajectoryInterpolation.time_trajectory_linear                                   |
|          | 64.2±1ms             | 66.8±0.8ms          | 1.04    | trajectory.TrajectoryInterpolation.time_trajectory_nearest                                  |
|          | 17.6±0.04M           | 17.6±0.04M          | 1.00    | trajectory.TrajectoryInterpolation.tracemalloc_trajectory_linear                            |
|          | 7.77±0.05M           | 7.77±0.05M          | 1.00    | trajectory.TrajectoryInterpolation.tracemalloc_trajectory_nearest                           |

Benchmarks that have got worse:

| Change   | Before [850a7845]    | After [6047a028]    |   Ratio | Benchmark (Parameter)                    |
|----------|----------------------|---------------------|---------|------------------------------------------|
| +        | 133±1μs              | 173±4μs             |     1.3 | import_iris.Iris.time_fileformats_nimrod |

Generated by GHA run 21675689108

@ESadek-MO ESadek-MO left a comment

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Just one suggestion on wording. Otherwise will be good to go (with a whatsnew either here on on a new PR)

Comment thread lib/iris/fileformats/nimrod.py Outdated
Co-authored-by: Elias <110238618+ESadek-MO@users.noreply.github.com>

@ESadek-MO ESadek-MO left a comment

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Thanks @HGWright, lgtm! Whatsnew is in #6938

@ESadek-MO ESadek-MO dismissed trexfeathers’s stale review February 9, 2026 15:39

Overridden by new buddy

@ESadek-MO ESadek-MO merged commit 10b6b06 into SciTools:main Feb 9, 2026
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@scitools-ci scitools-ci Bot removed this from 🚴 Peloton Mar 10, 2026
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Incorrect attributes added to nimrod format radar data on load

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