Quote Originally Posted by Husar
It takes away system performance and as long as my firewall and browser keep the bad guys out there is no use in cleaning the inside, right?
The amount of resources AVG uses are negligible for normal computing, but if you're really looking to free up everything you can, just disable it before launching demanding games/apps.

I run a linksys router, Spybot S&D, Spyware Blaster, AVG, and Firefox w/NoScript & Adblock. I've never had a problem.