IIS Super Slow

Ok, I'm new to this site, but I hoping someone will be able to offer some insight.

I have a web server that was set up a few months ago, and hasn't been used since. We installed a web app on it and haven't had the time to start using it until now. Here is my problem. A few months ago, everything was running at normal seeming speeds. Now, the server serves to itself very rapidly, but to other machines, it takes forever. It eventually does serve the page and graphics, but it's acting like it's swimming in glue, or suddenly traded it's T1 connection for an 800 baud modem. Even a simple 'under construction' page is served very slow, so I know it's not the app itself (unless the app has done something to the main IIS config). But with a simple UC page, with some text and 2 tiny gif images, it's still taking minutes to serve to a client machine. Bandwidth throttling is turned off throughout the IIS config. Does anyone have any ideas regarding this performance issue?

I suspect some kind of network configuration problem, not IIS. If your remote computers have a routing problem perhaps they need to time out on the error route before using the good route. Take a look at other network access to the web server.