Hello webkit-dev,

If you do not work on code that triggers JSC bots, you can stop reading now.

Configuration changes are coming to JSC bots in both EWS and post-commit. The 
changes are intended to increase JSC team's developer productivity in 
discovering more bugs quicker and earlier.

The changes will roll out in two phases.

Phase 1, JSC post-commit:
- Debug arm64 bots are moving from Debug O0 to Debug O3 (aka "Testing"). This 
should drastically improve runtime of those bots.

Phase 2, JSC EWS:
- arm64 bots are moving from Release builds to Debug O3. This change is 
expected to be a ~35% increase to the duration, from about 37 minutes to about 
50 minutes.
- Intel bots are unchanged, pending hardware upgrades.

Phase 1 will roll out next week, the week of November 10. Phase 2 will follow 
after validating the rollout in Phase 2 for 1-2 weeks.

Notably, once Phase 2 rolls out, assertion failures in JSC will block merging.

If you run into issues, please reach out to JSC team.

Thank you,
shu
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