Problem in Internet Explorer

SOMETIMES WHEN I HAS BEEN FILING FORMS BASED WEB PAGES WITH INFORMATOIN.THEN WHEN I MOVE WITH TAB OR BY CLICKING MOUSE IN NEXT TEXT BOX THEN SYSTEM HANGS FOR JUST 10 TO 20 SEC. WHY IS THIS HAPPENING. PLEASE PROVIDE ME SOLUTION FOR THIS.THIS OFTEN HAPPEN WITH MY FRIENDS ALSO.