When running some heavy applications like games or virtual box for some time.. the cpu usage is normal for some 15 mins and then suddently cpu usage increases. even after i quit the heavy apps and when i start some other apps, the cpu usage of the new opened application is also very high.. this continues until i reboot the system. There is no single particular process occupy more cpu. All the processes cpu usage is little high than normal.. Any solutions?
Answer
Is it possible that Intel SpeedStep or AMD's equivalent system, is throttling your CPU usage for power management. Check what power setting your computer is set to; in XP, the "portable" and the "max battery" settings will step the processor down to its lower speeds. You can use CPU-Z to see what clock speed the processor is actually running at. If your processor is running at 1.0 GHz instead of 2.6 GHz, for example, then suddenly all of the processes will be competing for a lot less power.
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