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Start perf-investigation-2 log
Ongoing notebook for round 2 of the odoc perf investigation.
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doc/perf-investigation-2-log.md
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# odoc Performance Investigation — Round 2
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Ongoing notebook for the next phase of odoc performance work, continuing from the `perf-bench-base` branch (merged into main as of `9357d7fd`).
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## Prior art
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- Original plan: `doc/plans/2026-02-15-performance-investigation.md` on standalone odoc `perf-investigation` branch
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- Round 1 execution: `perf-bench-base` branch, session log `~/.claude/projects/-cache-jons-agent-workspace-odoc-pp/5f6e8907-5c90-46cc-b1c7-06f4de7484da.jsonl` (through 2026-04-13)
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## Round 1 — landed optimizations
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- Physical-equality sharing + `is_identity` short-circuits in `src/xref2/subst.ml`
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- Sharing in `reresolve_*` and `prefix_signature` in `src/xref2/tools.ml`
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- `Of_Lang` path-conversion sharing in `src/xref2/component.ml`
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- Per-env `Shape_reduce.Make` cache in `src/xref2/shape_tools.cppo.ml`
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- `open struct` module-alias fix in `src/xref2/find.ml` (resolved 76K unresolved xrefs on `core`)
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- `ODOC_STATMEMPROF` instrumentation in `src/odoc/bin/main.ml`
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## Round 2 — open threads
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(Fill in as investigation proceeds.)
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## Log
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### YYYY-MM-DD — <topic>
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Hypothesis:
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Measurement:
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Result:
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Next: