SOTT looks ok for me now. Try again and see. Yesterday, I found RT to be slow too (to load twitter embeds). Probably tech companies are doing something. Some time back, during the net-nuetrality debate, there was a speculation that tech. companies will prioirtise who will good speed or who is not. Something like that. Anyway, it is too early to know.
It's loading without issues for me too. I think SOTT admins can see the number of people accessing the website so let's see if someone confirms SOTT really was under heavy load. Maybe it's just a glitch of some sort.