My iMac 3.5GHz i7 2013 with 256SSD took 10 hours to install Yosemite. On booting it it was extremely slow and unresponsive. Had to re-install OSX Mavericks through Carbon Cloner. What is going wrong, I was looking forward to the new OSX but now becoming disappointed with the Apple hype? Any thoughts on how I could resolve this or should I wait for 10.10.1?