[PERF] Investigate optimizations for large graphs

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`. 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.

Start by reading the linked Twitter thread and the issue notes about reference tracking, codecs, and built-in types. No files or tests are named; done would require a defined optimization scope and measurable acceptance criteria before implementation.

Written by the indexing model from the issue text.