spyware? Adware? Virus?
Deleting files (depending on how large) can take a few seconds if they are large files.
Have you tried adjusting the recycle bin properties to automatically delete the files instead of moving them to the recycle bin? That might speed it up.
Usually poor performance can be because of a recent software change like a newly installed program, or it can be a malware related issue.
It could also be that your hard disk needs defragged. Try it and see.. seems like the easiest of all to check. Give the hard disk a good defrag, and then see if deleting takes as long.
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