I definitely would opt for clean install. Start a fresh new install. I bet it will be like night and day.
Sticky thread at the top of this forum: How to Properly Migrate With a Clean Install to OS X Mountain Lion (From Lion/SL)So, I'm getting a LOT of conflicting opinions. So, can we have an guru or expert on this issue please?
I want to know if clean install make any real life difference? Not just housekeeping sake.