How can you blame the OS or the browser for slow server response?
I use Win 7 with IE 11 and FR is now one of the fastest loading/connecting sites I visit. Drudge on the other hand is getting increasingly slower.
Point is, it depends on the server and it's ability to handle traffic, not necessarily the machine you are using to connect.
I blame the OS for system freezes when a remote server having nothing to do with the system that the OS runs and then freezes is slow to respond, D’UH! A big D’UH!