So, I got my inlaws a new Mac at Costco a couple years back. I set it up for them and noticed it was running pretty slow initially. I just figured it was loading all of their crap and it was just going to take a bit. Anywho, they have periodically mentioned the slowness over the years and i've done some crap to it to clean it up. I finally told them to bring it to me and its weird, it is just slow as crap. My Mac is like 5 years older and way faster. I did everything I could after some googling and its still just slow. Took it to Apple this weekend finally and they were like, what the hell? They ran several tests and everything checks out. They said the only thing to do is some factory wipe and manual reinstall of the OS. I get it back here in a bit and am hoping for the best so I don't have to deal with it anymore, but it is really odd no one can figure out why it is so slow and I'm not optimistic that it will be fixed. I do feel bad I didn't do this sooner when I could have taken it back to Costco.