Window #1 & #2 are perfect, Windows #3 runs like crap.

If it was a performance hit I'd figure everything would drop, not just window #3

I do have them running on different cores

So, if I want to play my main, he has to be Windows #1 or #2, but I find that even if an alt is on #3 it lags so bad even autofollow doesn't keep up. It seems to screw up both FPS and network lag.