It’s a bit tough to say from the information in your posting. It’s likely one of the following things:
1). A system process that’s eating up CPU
2). Video driver-related problems
For #1, if you can go out to the command line and do something like “top” and see what might be consuming all of the CPU cycles, that would help point you in the right direction.
For #2, I don’t know what your video hardware is, but install the nvidia or ATI proprietary driver if you are wanting desktop effects and / or the desktop seems sluggish. Also, the system running slower problem … is it everything in general, or just desktop responsiveness? If you go out to a command prompt and do something there (like ls, top, cat /proc/meminfo, etc) do those come back instantly or do they take some time to execute?
But it should be fine. I use amaork in Gnome but I have been to ‘systemsettings’ and taken out the indexing in kde. If you haven’t installed the kde pattern, I’m not sure if ‘systemsettings’ will be available.
Top shows no significant cpu usage by anything, however the system monitor is at a steady 20-30% cpu usage so the two don’t seem to match up. Maybe this is normal… All the commands execute instantly. On an aside, top command shows 3 current users, all me, so I’m logged in three times?