Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
Internal ChangesKind: in v2.1.239,
Internal ChangesSection of the release
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.