Sophos anti-virus for Mac is free. It was the one UBC provided. I installed it on my computer, and didn't notice it slowing down too much. But times when I've had it uninstalled didn't really have virus/ malware problems either. Sophos picked up malware/trojan once.
Originally Posted by arctic_rogue
If you do give one or others a try, drop me a PM and let me know how it worked. I just put a new Crucial M4 SSD into my '10 MBP, so I'd hate to lower my speed gains with anti-virus software.
Did you replace the optical drive? I did it on mine with a Samsung 470 SSD using a optibay case/tray off eBay ($10-15 vs $100 MCE optibay caddy), and put the SuperDrive into an enclosure. Used Ifixit guide and other online ones.
This one probably best overview.
there was a few anxious moments when my computer wouldn't boot up afterwards. I think it was mainly because I had trouble reconnecting the keyboard cable back so the power button didn't work. Have had to use the Superdrive only twice since then.
Works much faster now, though battery might be slightly less, and fan runs more.