Hey, One performance behaviour I can link to possible UI processing is this. I pause a single player game and Alt+Tab to windows, under Process Explorer SoSE is using 100% on one thread with a stack into the Kernel32.dll for function RegisterWaitForInputIdle. I am assuming that your primary thread is handling your event loop. From a programmers perspective, I think there is something wrong there if it is sitting at 100%. Can others confirm this behaviour?
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