Copying files slows X GUI to molasses



I'm running Ubuntu 5.10 (kde) on my Thinkpad T42. If I mount a cdrom
and copy the files to my internal HDD the GUI slows way down and is very
sluggish. I guess I must have something misconfigured. Any suggestions
on where to look? I am completely clueless when it comes to this type
of problem.

Thanks.
.