I've experienced this issue as well. Just a few minutes ago.

99% of the time all is fine. The site loads no problem and going from forum to forum works well. Then out of the blue when I click a link nothing happens for maybe a minute. Then normally if I just wait all starts working again.

I have Disabled Phishing (not just turned it off) FireFox does not seem to have this issue (at least not so far)
 
A friend of mine actually gets lock ups sometimes when visiting this site via IE to the point he has to reset his router he says (though maybe like my issue if he waits it out, it starts to work again) When he uses FireFox no problem.