ibook slow down :(

I think my ibook is slowing down. I use to be able to surf the web without losing my curser and spotlight didnt take long at all to find my stuff. My internet connection hasnt changed and I havent put a lot of files on it. Any idea why it might start slowing down out of nowhere?

Try repair permissions in Disk Utility. That is known to fix a lot of odd happenings in OS X.

How much memory do you have?

I have 512 of pc2100 ddr