CD sticky, slow to respond

i have had some recent problems with CD but that cleared itself. unfortunately the same problem returned but only briefly. once again it rectified itself but left another problem which does not occur in IE.

on my site using the thread reply the problem manifest itself most strongly. it becomes sticky and slow to respond and refresh. one example is when typing nothing happens then perhaps 10 to 15 seconds later the type begins to appear. comodo back button, home button and buttons within the site of the reply do not work for up to 20secs.

w7 ultimate 64b
av comodo
firewall comodo
4gig ram
30mb bb