I have a Macbook Pro Retina 13" which I bought around November of last year with these specs: Haswell i5 @ 2.40 GHz 8GB RAM 256 GB SSD After its 1 year anniversary I have noticed a decrease of performance which has been bothering me a bit, it isn't something that is making my computer worthless but it bothers me from time to time. Do you think I might have a virus? I don't really have many programs running. For example, right now I have Safari, Messages, Powerpoint and CCleaner running. CCleaner is only running because I'm scanning through the computer to clean system logs etc. I have VirtualBox with I think 2 Windows OS's running but I never use them. They occupy a good amount of GB in my system, like 20 GB total. I'll delete them but I think that its not it.