My system is beachballing while opening little things like SysPref and About this Mac. I did a full reinstall of the OS to 10.10.5 without restoring from a Time Machine backup, but the problem is still there. I also tried verifying and repairing permissions via disk utility. It's a MacBook Pro (Retina, 13-inch, Late 2012) with 2.5 GHz Intel Core i5 and 8 GB 1600 MHz DDR3. There's about 50GB of free space out of the total 120GB in the system as well. Any idea what could be wrong? The local Apple Care is saying that I have too many apps installed but that is not the issue.