Vista + FireFox + Cassini Web Server (Visual Studio Web Server)
I've been having problems with this combination - pages served by Cassini take an age to load in FireFox - and I did a search yesterday and noticed Rick Strahl and others were also having problems so it wasn't just me. I've pinged the ASP.NET team and they're having someone take a look at it to try and figure out what the problem is. Of course they don't have a repro machine so I have a feeling they may be remote desktop'ing into mine... I'll let you know how things progress.