Hello everyone, I have a mid 2010, 21" iMac with i3 processor that is running slow. I have my iphoto and itunes library on an external hard drive. I just bought a MBA 11" and it's super fast! What can I do to boost speed? 1. swap out the HDD for an SSD or Hybrid drive? 2. add more RAM? 3. or simply wipe everything out and start from scratch again. 4. All of the above. Thanks!