I just noticed display fusion was using 10-25% of my cpu and over 900MB of ram, which doesn't seem right. Before I restarted the program it was lagging so hard right clicking on the taskbar didn't bring up the menu for quite some time. I've never noticed this behavior before and I haven't done anything out of the ordinary lately. So I don't have anything else that could help.

I get this too, it just happened a few releases back, now display fusion is unusable, shortly after I start it it just sucks cpu and slows down my workstation. This better get fixed fast.

Same with me.

I've noticed the same problem and have been able to isolate it to having 2 Excel windows open. It doesn't matter if they are on different monitors or the same. Closing 1 drops resource allocation back to normal (from 25% overall and 1 thread saturated back to 1% overall). Multiple Outlook, Word, IE, Acrobat, etc windows don't produce the problem, only Excel so far. I've sent you a log file.