Hi everyone, Upgraded to El Capitan last week and it hasn't been a great experience. App's are crashing, the wheel of death is a regular occurrence even for the smallest tasks e.g. Apple>About This Mac. The iMac is just generally slow. I time machined about three weeks ago, so I can go back to Yosemite, but before I do, I wanted to pull on the experience in this forum to see whether there are any known issues with El Capitan that I could check for? Or is it generally accepted that this OS is problematic for older machines? Thanks in advance for any first hand experience or advice.