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[Workflows] Changelog & docs updates for increased concurrency, creation rate, and queued instance limits #29867

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mia303 merged 2 commits into from
Apr 15, 2026
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[Workflows] Changelog & docs updates for increased concurrency, creation rate, and queued instance limits #29867

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workflows/limits-increase-changelog-and-docs
mia303 Apr 14, 2026
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Update 2026-04-15-workflows-limits-raised.mdx
mia303 Apr 14, 2026
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20 changes: 20 additions & 0 deletions src/content/changelog/workflows/2026-04-15-workflows-limits-raised.mdx
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---
title: Increased concurrency, creation rate, and queued instance limits for Workflows instances
description: Concurrency limit for Workflows instances is now 50,000. Instance creation rate limit has been raised to 300 instances per second per account, maintaining a limit of 100 instances per second per workflow.
products:
- workflows
- workers
date: 2026-04-15 13:00:00 UTC
---

[Workflows](/workflows/) limits have been raised to the following:

| Limit | Previous | New |
| ------------------------------------------ | ---------------------- | ----------------------------------------------- |
| Concurrent instances (running in parallel) | 10,000 | 50,000 |
| Instance creation rate (per account) | 100/second per account | 300/second per account, 100/second per workflow |
| Queued instances per Workflow [^1] | 1 million | 2 million |

[^1]: Queued instances are instances that have been created or awoken and are waiting for a concurrency slot.

These increases apply to all users on the [Workers Paid plan](/workers/platform/pricing/). Refer to the [Workflows limits documentation](/workflows/reference/limits/) for more details.
6 changes: 3 additions & 3 deletions src/content/docs/workflows/reference/limits.mdx
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Expand Up @@ -29,9 +29,9 @@ Workflows cannot be deployed to Workers for Platforms namespaces, as Workflows d
| Maximum `step.sleep` duration | 365 days (1 year) | 365 days (1 year) |
| Maximum steps per Workflow [^5] | 1,024 | 10,000 (default) / configurable up to 25,000 |
| Maximum Workflow executions | 100,000 per day [shared with Workers daily limit](/workers/platform/limits/#account-plan-limits) | Unlimited |
| Concurrent Workflow instances (executions) per account [^7] | 100 | 10,000 |
| Maximum Workflow instance creation rate [^8] | 100 per second [^6] | 100 per second [^6] |
| Maximum number of [queued instances](/workflows/observability/metrics-analytics/#event-types) | 100,000 | 1,000,000 |
| Concurrent Workflow instances (executions) per account [^7] | 100 | 50,000 |
| Maximum Workflow instance creation rate [^8] | 100 per second [^6] | 300 per second per account [^6], 100 per second per workflow |
| Maximum number of [queued instances](/workflows/observability/metrics-analytics/#event-types) | 100,000 | 2,000,000 |
| Retention limit for completed Workflow instance state | 3 days | 30 days [^2] |
| Maximum length of a Workflow name [^4] | 64 characters | 64 characters |
| Maximum length of a Workflow instance ID [^4] | 100 characters | 100 characters |
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