11 Ways to Optimize Your Mac's Performance

None of these tips will improve your Mac's performance like more RAM, a faster hard drive, or a CPU upgrade would. They mostly have to do with reducing memory use by limiting the number of active processes and freeing up drive space, since a too full drive (especially past the 90% mark) can slow down your Mac. These are tips for getting the most out of the Mac you currently have without investing in any upgrades.

Full Tips @ loWendMac