Lagging problems, even after fresh format

Hey guys, I'm having some subtle lagging problems on my macbook pro (2.53ghz, 4gb ram, 500gb HD, purchased this year)

For example, I would click on an application in the dock, and it would take a split second for the icon to start jumping.
Or I would start to write a text, it would lag for a split second between the letters, and then continue writing the letters that I previously typed.
Or I would click on any button, and it would take a split second for my click to be registered.

I think this started to happen after I installed Logic Pro on my laptop. The software is like 10 gigs and it was constant writing to the hard drive for hours on end.

I tried a fresh format with zero-ing out the drive as well, but I'm still having the problem with almost nothing at all installed.

Any idea what the problem might be?

Thanks a lot!

Probably your HDD trying to keep up.

use

Thanks, any other thoughts?

Robert

I'm having a similar problems only with video lag, I think it may be related to a damaged graphics card. I had my HD overheat and then replaced it but since I have little lag spikes anywhere from 1-5 seconds. I just wiped my HD and re-installed with no luck fixing it. So if you find out let me know.

any other thoughts guys?