antivirus
I bought Macbook Pro 13 last year, It is really slow now sometimes i cant even close the opened windows and i have to restart it. I dont know whats wrong with it .
MacBook Pro (13-inch Mid 2012), OS X Mountain Lion (10.8.5)
You may find the solution in these comprehensive trouble shooting documents:
https://discussions.apple.com/docs/DOC-3521
https://discussions.apple.com/docs/DOC-3353
Contemplate any anti-virus as a last resort. That is very unlikely your problem.
Ciao.