So I have been having intermittent issues with my Mac for a while now, but usually not enough for me to worry. Now it has just gotten extremely worse as of late. It is extremely laggy at times, it has been overheating while performing such mundane tasks as browning the web, and it won't back up with time machine(or at least tries to, but takes FOREVER!). I've been able to deal with the sluggishness, but the overheating is what has me concerned. Any ideas or suggestions before I take it in to an Apple genius?