Micro-optimize chained plugin #19464
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Avoid using lambdas in the most expensive hooks, since they are slower than direct method calls. Also use `if hook is None` checks instead of `if hook`, since the prior is more efficient when compiled. I used trace logging to look for generic/unoptimized function calls, and it was clear that ChainedPlugin was doing many unoptimized calls that were easy to avoid. This is a part of a set of micro-optimizations that improve self check performance by ~5.5%.
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
sterliakov
approved these changes
Jul 16, 2025
It didn't come up much in my use case, but it's true that it could be a bottleneck in other use cases. I'll do it in a follow-up PR. |
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Avoid using lambdas in the most expensive hooks, since they are slower than direct method calls. Also use
if hook is Nonechecks instead ofif hook, since the prior is more efficient when compiled.I used trace logging to look for generic/unoptimized function calls, and it was clear that ChainedPlugin was doing many unoptimized calls that were easy to avoid.
This duplicates some code, but I think it's fine since this code is updated very rarely but the code paths are very hot.
This is a part of a set of micro-optimizations that improve self check performance by ~5.5%.