One thing I noticed about PS is it does not increase it\'s priority when it is in focus.
I noticed that EverQuest was set up that way and I now understand why. Several of my games do not do this and the lag in the game becomes unbearable. I have a piece of software that automatically controls the priority of the foreground window, and when run with planeshift the majority of the lag disappears.
Something you have to realize from a users point of view... while you and me may run fairly clean machines, many other users do not. They have all their neat little download tools, and weather updates, and media updates... stuff that WILL attempt to take processor time away from other software such as PS... unless PS\'s priority is higher effectively giving less time to other unessential processes.
Processes work in several levels for those who do not know...
0 Low Priority
8 Normal Priority
13 High Priority
15 Realtime
Few programs default to low priority, but things such as Virus Scanners, Popup Blockers etc belong here since they require little processor time but will ocasionally choose to be a hog.
Normal Priority is where most programs default to, when everything is crammed here it has equal rights to processor time.
High priority is where your fullscreen games should go, if you\'re not doing anything other than that game nothing else needs processor time.
Realtime priority is generally left to system processes that are REQUIRED to run your system. However games can be put here but don\'t expect to do ANYTHING else until that game is closed.