Cancellation performance regression in between 1.8.1 and 1.9.0 #4529
Description
After updating coroutines version from 1.8.1 to 1.9.0 (androidx/androidx@8d8805e), Compose's benchmarks heavily relying on cancellation showed 10% performance regression.
Affected benchmarks include:
I was able to reproduce the regression locally, and for EffectsBenchmark.launchedEffect_remove with a count parameter set to 100 median execution time dropped from 1.4 msec to 1.6 msec.
KotlinCoroutinesBenchmark.cancelCoroutineScopeWithJobs100's median time dropped from 7.7 msec to 8.2 msec.
It seems like it all might be related to 2803a33, but I was not able to formally confirm that yet.
The issue was originally found and reported by @ShikaSD