[PERF] Investigate optimizations for large graphs

[ReubenBond]

See this twitter thread for reference: https://twitter.com/neuecc/status/1589902671540256771?s=20&t=AcVRk8mwSdMyQJT2c5jyDg

Note: we could also consider avoiding reference tracking for types by default. There are some complexities involved, like what do you do with built-in types, eg string, byte[], List<object>. You could potentially have ref-tracking variants of the codecs or pass a reference tracking preference to the codec and have an attribute per-property to indicate a reference tracking preference.

We've moved this issue to the Backlog. This means that it is not going to be worked on for the coming release. We review items in the backlog at the end of each milestone/release and depending on the team's priority we may reconsider this issue for the following milestone.