I have exactly the same problem as El Loro.

Over the last few days it's been particularly slow when posting. I also know when I'm about to get a server error - if I'm in a post reply box and I attempt to press a smiley or should that be a graemlin

, the box stays blank and then I get a server error message

and I'm thrown out

. It usually only lasts for a minute or two then I log back in. It can get frustrating though as it happens a lot.
My browser is Google Chrome.