When unpacking a file foobar2000 has lots of trouble playing music (or when searching the harddrive, or while doing a virus-scan). This is strange because the cpu-load is only about 20%. Giving foobar2000 a higher priority does not make a difference. Also explorer seems to react much more slowly.

Why is this?

Thanks.

Disk activity. Perhaps foobar does not load enough look-ahead music data into memory to cope with playback while the hdd is occupied with other work. Try another media player. VLC, perhaps?
Jacking up CPU priority of foobar probably would not affect the latency of disk access from a just-previous CPU operation on another thread.
Just guessing....

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