I am running FC5 upgraded from FC4 on a Dell Inspiron 600m. When my xscreensaver starts running the processor goes to 100%. It did not do this when I was using the Gnome screen saver. I am trying to switch back to the Gnome screen savers. Will keep you updated if the Gnome screen saver fixes my issue that is the same as yours.
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Terry Snyder Jr
Computer Support Specialist
http://www.personal.psu.edu/tes215
Linux (Red Hat 5.2, 6.0, 6.1, 7.1, 8.0, 9.0,Fedora Core 3, 4)
Windows (3.x, 95, 98, ME, 2k, XP, 2k3)
Mac (7, 8, X)
I have used them all.