Are these problems only on the forum side of things? That knowledge might help me diagnose the issue more effectively.
It seems to happen on the main site too. Navigated directly between two reviews and had the same symptoms. While testing that I also noticed that if I hit Back, then Forward, any further use of those two buttons to navigate between those two pages is near instant, as long as I don't try to go elsewhere first. In Chrome the pages seem to reload every time, no matter how many times I click Back and Forward.
I also noticed that the front page right now never stops loading, both in Chrome and Opera. Some kind of resource is probably trying to load from a server that isn't responding.