Are you sure it's not just flash (from e.g. ads) acting up? On my win7 laptop the only time I saw pages freeze was due to a plugin conflict where somehow flash

Are you sure it's not just flash (from e.g. ads) acting up? On my win7 laptop the only time I saw pages freeze was due to a plugin conflict where somehow flash managed to install itself twice as a plugin; disabling one of these would usually fix it. Or, you know, just try disabling flash altogether and see if there's a difference.