I've just recently reinstalled OS X 10.6.8 to fix a Finder/catalog problem. Everything is working fine now.
Before that I noticed my machine was noticeably slower than when I first got it. I started using MacKeeper (Version 1.9) to optimize and for anti-virus.
Although, the reinstall did seem to improve performance, it isn't as fast at startup as before. Also, shut down is much slow after app. install or anything requires the Admin password. Did read performance tips on other Slow Mac thread, but was hoping for a tip on a better optimizer/antivirus app. or anything else that I can do to increase speed with the hardware I have (can't afford anything new).
