I read C3 is supposed to only revert to DOM with the auto option if you're using scripting, but as far as I know I have no scripts in my game. Do custom effects also apply to this? I am having random jank that may only be while worker is activated, but I would need to do more testing.
Currently worker mode "auto" will only switch to DOM mode if you use any script file or script block in an event sheet anywhere in your project. You can still change worker mode to "Yes" or "No" to force it to use one or the other instead of using "auto".
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I don't recall putting anything like that, but I guess I can try to search all the event sheet files for the text that denotes a script block.
EDIT: I think I must've accidentally added one because there was a blank one.