Problems with periodic slowdown and pages freezing up

For some time now we’ve had problems with a couple of Domino Web Applications. What happends is that when loading pages they suddenly just freezes up and takes ages to load. Typically we just get a white page displaying for 10 - 60 seconds, before the page is displayed as normal. When this happends the IE Statusbar normally is reporting that it is waiting for a small gif or something. We’ve alos seen cases where the topmenu isn’t displayed correctly, typically there are gif’s missing.

Our pages is based on domino, html, lots of javascript and css. We uses Domino Agents and we also have a connection with Websphere that we call on quite often, for instant every time we navigate in the menu.

Our server is running windows 2003 with Domino 6.5.3. The server shows no problems with treads or resources.

We found a article (http://www-1.ibm.com/support/docview.wss?rs=463&uid=swg21172867) describing what looks like our problem, but this fix is already installed in our server.

Are there anyone who have experienced something like this?