I just set up a new SBS 2008 standard machine for a client with 10 users. Ever since the install, internet browsing for end users has been unusually slow--slow in a very strange way. It seems that some sites won't load at all, others will load with incorrect formatting (as if part of the HTML code was missing) and some load just fine. Yahoo is a good example. Some users see the entire screen in more or less plain text, scrunched to the left side of the screen. Others get the normal Yahoo page, but after a delay of about 30 seconds.
This is on a relatively slow DSL line (1.5mbps/768kbps), but prior to the SBS install they never complained about slow internet speeds. Furthermore, I can access the server and client desktops remotely just fine, which leads me to believe this isn't necessarily a bandwidth problem.
All clients run Windows XP and were joined to the domain using the Connect Computer wizard. They get DHCP and DNS from the SBS machine. Exchange is running inbound and outbound email through a third-party filtering service.
The client is (understandably) getting quite agitated about the browsing problem, so I'd appreciate any insight. I've done plenty of SBS 2003 installs but just a couple of SBS 2008 installs, so maybe there's something I'm missing?