I don't know what the big deal is as to the why of this. Ok, if you really want to know, we are experiencing issues with our pc's that performance is becoming terrible. Going into task manager and looking under performance I am seeing 50% cpu usage even with nothing running. Don't bother saying virus because we are not even connected to the internet or anything. I can see right away that Desktop Composition is one of the chief culprits. Disabling this usually completely fixes the problem, but not always. Sometimes the cpu usage will drop from 50% to around 20%, most of the time it will drop from 50% to 1%. What always works is setting setting the Adjust for Best Performance option. This always drops cpu usage down to 1%. I suspect it was a windows update that has caused this but I really am not sure and I don't have either the time or desire to try to experiment uninstalling and re-installing a ton of windows updates in the hope of finding the culprit, if that even is the problem. Especially when setting adjust for best performance always fixes the issue.