I have a third monitor that whenever I interact with any apps on it, everything crawls. The mouse moves slowly, apps redraw slowly, etc. It's driving me nuts as you can imagine.
I'm running Windows 7 64-bit using 1 GTX460 for 2x Samsung monitors and 1x 9800 for this problematic third Dell monitor.
It used to be that the only app that did this was Windows Live Messenger whenever someone shared an image/doc/video. However after updating Thunderbird it also experiences the same issue.
Any ideas what could be causing this, and how I can fix it?