Somewhat confirmed here:
It's not as if the forum in general is slow, it's 50% of the times I try to go to a page, it takes a minute or so to load - or is just plain stuck "for ever". When refreshing often it'll only load the page, not the CSS.
Then at other times it's instant - fast.
But overall it's pretty bad - I often have several tabs open trying to load the forum in the background, while shifting back and forth to Unity, to see if something is happening, refreshing, waiting..