A lot of these issues have to do with software that checks for updates. These Auto Checks, often use resources unwisely, and do not take into account other applications running. I disabled most software Auto Checks, except for Windows Updater and my AV (I use AVG). I am not familiar with PS, but you might want to look at things like Image Finders, and updaters. Those tend to screw with other programs more often that an out of date driver!

ratscloset
aka John