TS client on XP and IE6 SP1

System

Hi,

I'm using TeamSite 5.5.2 SP4 running on a Win2K Server.
I'm able to access the TS without any problem from Win2K clients running IE6 SP1.
When I try to access from a XP client running IE 6 SP1 (ver 6.0.2800.1106.XPSP1.020828-1920) the server response becomes very slow. Clicking on the navigation tree (in webdesk view) takes 10-15 mins to respond.
Proxy is disabled in my IE setup. I've Sun JVM 1.4 installed on the machine. Even Microsoft VM is present.

Has anyone encountered this? Is there a fix for this?

Thanks in advance