Firefox likes to gray out and become unresponsive for five minutes at at timerandomlyChrome won't load for five minutes "Page unresponsive Kill/Wait?" also can'tfind bookmarks for ages
I was having the same problems. After I made the swap file bigger, that wentaway. I donot know if that was the problem but making the swap file to 3.5 to 4 timesbigger than ram help.