It has been painfully slow today (FF 3.5.1)... like go out for a capuccino slow. Page-loads sometimes take a minute plus, and when they finally load some parts are missing... like previous posts and the reply box when selecting the 'last page' on some of the longer threads. Although forced refresh usually restores everything, it is quite slow.... and replies often result in the "It seems one of our coding pigeons has slipped up" error message. However, when revisiting the thread the reply is there.
Also, when selecting *say* the entire 'General' section while page load times are very slow, only the category header view appears rather than the full general page. I noticed also that 'last poster' details are not being updated... eg, I was the last poster in the "Blank of Borg" thread, yet DrJBHL shows instead... just in case nobody else noticed.
