Uh.. I like Sophos McLovin. Thanks anyway. My iMac is my main computer. Sophos doesn't really affect my performance as I have a 3.6 dual core i5 processor as well as 8 gigabytes of RAM. My firewall is turned on, just forgot to put that there. And I might upgrade to Lion, if I have enough time. McLovin, Safari is great on a Mac. I just chose Google Chrome because I feel it's less cluttered. I don't know why... And win7holic, I notice you are Chinese. Don't see a lot of Chinese on security forums. I am also Chinese.