I was having an issue in Mac OS X over the past couple weeks where getting info on a file was taking forever and anything downloaded from within Safari was forcing Safari into a semi-unresponsive state where all tabs would cease to function. I intended to take it in to the Apple Store (my second visit with the MacBook) eventually but when I realized Spotlight wasn't working I started investigating myself. For some reason the Spotlight database had become corrupted and was slowing everything down so I took this quick bit of action: sudo rm /.Spotlight-V100 That'll delete your Spotlight index and Spotlight will quickly kick in to gear to replace the index fully. It seems like that's completely solved the problem for me.

Also, I was having a strange issue with vertical pastel-colored lines on boot after I installed the MacBook firmware update of about a month ago (I was forced to boot up by using command-option-p-r every time to get around it). That also seems to have corrected itself although I highly doubt that it's related.