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Why is the unzip so slow, if the processor is not 100% busy, disk I/O is not saturated, and there is enough memory?

I'm using Win7 x64, but this was just an example. (The package can be anything big enough to measure the time).

Why doesn't the decompression use 100% CPU if there is something to do (or 50% with two cores, doesn't matter)?

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What software do you use for unzipping, and what format is the file? deflate, winzip, pkzip and 7zip are all "unzipped". – Eroen Dec 4 '11 at 21:03
@Eroen using winrar and format is .zip – Abhinav Pandey Dec 4 '11 at 21:05
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Check the multithreading option in WinRAR settings and uncheck Low priority option.

Make sure you are running the latest version of WinRAR or just use 7-zip.

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