you can check other popular AV programs according to CNET weekly downloads.
Else to the slowdown with AVG 2011, what is the hardware configuration and which other protection applications or firewall you are using? Is the slowdown visible on some webpage every time? Please provide us with used browser (and its version) and that link.
Years ago (>10 internet time) I first used AVG which provided efficient scanning and screening against viruses. It was fast and efficient. Since that time AVG has consistently provided more functionality but also added more overhead to my computer. This latest version (AVG11) has resulted in a major slowdown of web page surfing and email procurement. I've disabled outgoing email scanning and link web page scanning. Any recommendations on another efficient AV program?