There is a low-perf dynamic light mode coming in a future patch that will be usable by people who are seeing issues. Performance problems are not widespread, and they aren't considered game-breaking, so we didn't try to cram them into the day-1 green patch. Apologies to people who are having issues, and I hope we can get a resolution for you soon.
Dynamic lighting being enabled is non-negotiable because of the fixed classic nighttime darkness.
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