Here is a curiosity question about CPU usage in Windows XP -- not important, just wondering. This question shows my ignorance of the computer.

I notice that the computer execution speed seems independent of the CPU usage. For example, suppose that two processes are running simultaneously, with one normally taking up 50% of CPU speed as shown by Task Manager if running alone, the other normally taking up 20% of CPU if running alone. Thus, 80% of processor speed is in use, leaving 20% idle. Both use disk access but not excessively. But it seems that both programs are slowed down quite a bit -- one would think that there would be little slowdown (allowing for some disk & RAM reads/writes).

Why is there such a great slowdown on execution time that, I think, can't be explained by the disk bottleneck?


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