Gordon said:
The two major players would be Firefox and Safari.
Doesn't matter which browser you install, they all slow down or freeze
if the conditions are right for it. Local issues on the computer aren't
the only factors involved. Web server bandwidth issues that your choice
of browser has no impact on also cause slow-downs and freezes. It
wouldn't surprise me if that was the main cause of most peoples complaints.
Between Vista and Windows 7 I currently have 5 different browsers
installed and they all exhibit more or less the same behaviour on the
same websites. (IE8, Firefox, Maxthon, Opera, Safari) Occasionally
security settings or interaction with the AV/anti-spyware will affect
one browser but not another. Other than their various feature sets I
haven't seen much to choose from, between any of these 5 at least.