Ok, well my Mac is very laggy as of now. I have 27 GB of HD free, and still 100 MB RAM left. I was told to repair disk, repair permissions, and clean caches. I decided to download MainMenu, and use that to clean caches. Do I clean all caches because I have multiple options as for caches. Just do 'em all? Also, should I repair disk? I will repair permissions, but disk? Finally, I will run maintenance scripts. Is this OK to do?