Antivirus Software - How much do they affect a PC's performance?

stealthyexplosion

Reputable
Jul 26, 2014
23
0
4,510
Of course I want my PC to be safe from viruses, malware etc, but I don't want my PC's performance to be seriously affected because of the antivirus software running in the background. As of now I'm using Norton 360, so it does more than the cheaper editions, but probably affects performance more.
I just wanna know how much...