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Originally written by Red_Sage: I'd just like to point out that all games by their nature use ~100% of the CPU time because they are either using most resources exclusively when in focus and even when idle, run a nonterminating main loop. Hence the CPU usage. Not a bad thing. The CPU usage is likely unrelated to your problem.
Not all games. Decently developed ones cap the framerate and sleep inbetween finishing one frame and starting the next if there is spare time in between. Granted most games just take every cpu cycle they can get and if you want them to cooperate with other apps you need to drop their priority.