See below:
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I just tested how WinEQ2 works for me. Sadly it doesnt help with the lag at all. I tested the one core thing as well. And the /dyn off as well. I went through it all.
It seems like I have lag all the time, but it gets more intence as soon as I have more than 2 NPCs/PCs within my view, which might indicate the latest changes in light have something to do with it? Donno. Im kinda frustrated, as its unplayable atm.