Under the hood
Useful1 Signal2
Turns now wait on a lock before reading, and slow waits get logged.
What's wrong with this entry?
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What
Each turn now takes a read lock before it starts iterating, serialising its reads against the previous turn's result. If the wait exceeds 5 ms, a debug line is logged beginning "[engine] turn read waited".
Evidence
ms for the previous turn's result
Strings lifted out of the shipped bundle, so the claim above can be checked against them.