My CPU seems slower all of a sudden. Handbrake used to convert a 720p TV episode into Apple TV 2 format in about half an hour, now it's taking over an hour. Also, I tried to copy about 16GB of files from one folder into another and it took 15 minutes. Am I just imagining this problem? Are those normal speeds? 2011 13.3" MBP, i5 with 4GB.