I posted that before somewhere a while ago, this happens only when AIS is installed. Pages are not too slow to load, but there's a wait (1~2 secs) before the loading starts, and then the page is instantly displayed. This happens on any page, any site.
Again, I only got this issue in FF4 and when Avast 6 is installed. Any idea?
ps: disabling any shield doesn't change anything.