How-To: Now’s the right time to swap your old iMac’s hard drive for a fast new SSD | 9to5Mac

How-To: Now’s the right time to swap your old iMac’s hard drive for a fast new SSD | 9to5Mac: "There’s something you can do for $200 to $500 that will radically change your iMac’s performance: install a solid state drive (SSD) in addition to or instead of its original hard drive."

This is a great and practical idea that I have myself done to my oldest Mac.