Right now the site is running slow due to super high volume of new registrations and some scheduled site maintenance. It should be back to a normal speed soon.
I'm using ver 3.5.6 and hadn't had any problems until tonight.
You will likely experience very slow speeds, and unfortunately it could last for a couple of days. Also, I wouldn't call it 'regular' site maintenance. We are actually doing some software and hardware upgrades to better prepare the site for it's resource-hungry features and a larger audience. Once completed, we expect the users to experience some super-fast speeds in all areas of the site.