Speed up transitive_dep_hash for singleton SCCs#21390
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
JukkaL
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May 22, 2026
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This adds some duplication, but a 1% perf improvement makes it worth it.
KevinRK29
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I noticed on a large codebase ~99.84% of SCCs are singletons.
So the two main changes are adding a singleton fast path and extracting
graph[id]to be a local variable so that it does the lookup once per module rather than once per dependency,The time in the
transitive_dep_hashfunction drops 22%, and improved the overall warm run by 1%