I'm on GMT, so plenty of my time on here is spent on what would be early morning in the US & can't say that I've noticed a problem other than the generally slow page loading in comparison to most other forums.
One thing that I have noticed is that there are a few signatures with animated images (GIF's I'm assuming) that slow pages loading & cause a scroll lock / slow down when they are viewed - most are fine but there are a few that may take about 10>15 seconds from appearing to disappearing from the screen when I scroll over them......................