Rose: Check with different browsers. For instance, nowadays IE7 only displays a page after it was completely loaded - larger pages, like Boards with 100 messages, will simply take longer to display. Check if changing browser helps at all.
Also, it it's happening to some players and not others, then it may be because of their BK's configurations. There's loads of things you can enable or disable and some of them do have an impact on performance, no matter if Fencer syas the site is working great or not. I remember coan posted something about it some time ago. For instance, I have most of the game comboboxes disabled, only display 5 messages per page on boards, have no context menu, smilies popup disabled, etc.
But if if you try and disable certain features, and reduce the load per page, and see that the site starts getting faster then post it here - it will help others know what to disable and help Fencer know he has to optimize that feature...

Fencer - anych chance we could have different configuration profiles? That way I could simply choose a profile to use at home and another to use when I'm on a wireless connection with less bandwith.
It could also help on testing different configuration profiles - I'd change all settings with one click and could immediately see if it had any impact on the site's performance at all...