I have a 2+ year old iMac. Never noticed any performance issues until today. While working on some music projects, quick-saving took close to 10 seconds. It's normally instant (less than 1 second). The project I had open wasn't any more resource-heavy than usual, so it's not the project files. I've heard that while Macs don't require regular defrags, performance can take a hit after a couple years of regular use. The only defrag apps I've seen thus far are $50+. Are there any free utilities for defragging?