Xen users - Sep 2013 - Some webpages loading incredibly slow (if at all) in a Windows DomU

Hi folks,

I''ve got a Windows XP x64 DomU under Xen, and I''ve noticed
that pages
from some web servers, most notably Facebook, and AMD seem to get stuck 
after loading for a short while. Neither does refresh help. They are 
just completely stuck. It doesn''t seem to matter which web browser
I''m
using. The Windows DomU has got 2GB of RAM reserved, and there are no 
starvation of resources.

I''ve got no firewall in the machine, and disabling antivirus software 
has got no effect. Dom0 has got plenty of memory, increased ticks in the 
scheduler, and 2 dedicated VCPUs. The machine has got one NIC, and the 
DomUs connect to a bridge br0 that is created from eth0.

Other network stuff seems to work without problems.

I''m using the PVOPS drivers for Windows.

Anybody got a clue, and I''d be grateful.

Best regards,

Peter