I'm no tech expert (just a lowly designer
) but i think you're wrong... I'll ask my netnerd friends tomorrow. Each time you reload, you're sending a request from each browser and their server will try and deal with each and every one. There's one guy on there with multiple computers each loaded up with multiple browsers!
Netcraft has some details of their server actually... Windows Server 2003 with IIS6, so it's a bit old software wise but they also have Citrix Netscaler which appears to be some load balancing equipment or software.