Quote Originally Posted by 'Fursphere',index.php?page=Thread&postID=177389#po st177389
Quote Originally Posted by 'Pocalypse',index.php?page=Thread&postID=177385#po st177385
Did cap FPS on Alt WoW instance? (both foreground and background caps)
Yes, 45/25 on all slaves, 60/25 on main.

Did you set processor Affinity for each WoW instance?
Yes, 255 for all.
On slaves go 36/20 on slaves. No need to go any higher. (basically you'll tell WoW to stop trying so hard. )
You haven't mentioned if you've tried the above suggestion. Personally, I think this one is huge. While my system is not quite as nice as yours (i'm on an older quad core with 8 gb memory and a GTX8800), it's still pretty decent. I get non-linear performance degradation if I set my maxfpsbk too high. I have it set to something really low like 5, actually. The FPS comes right back up when I switch to a slave and 5 fps is fine for watching follow/placement of your non-mains.