my iMac 2010 (2.8 iCore 5, 8GB Ram) which I was very happy with, started to run very slow and it is killing me (and my wife). It happened approximately after I installed Lion, but I cannot time exactly to Lion installation. It is like processor is struggling or not enough Ram but it is plenty of Ram. All the sudden iMovie takes forever with every job. The same types of 1080p video play choppy on VLC player and freeze. Every few minutes when I am on the internet (either use Safari or Google chrome) iMac would freeze for 5-10 seconds and then starting to operate again. When I am working with photos on Adobe Lightroom, when I go from photo to photo, it takes a few seconds to open photos, which has never happened before. I am not using any new programs that I have before. What do you think happened? How can I fix it? Or do I need to take to the Genius Bar? It would be a pain because I use it every day.