Well it's not slow for me.
I've disabled wysiwyg and that surely helps.
but in conclusion Erwin and Logician made the correct points.
the JS for threaded mode/quickreply slow down the pages.
As we don't use the threaded mode Erwin and me will discuss about removing the whole JS part of it with the final vb3.
As for Logicians part: yes, the table-structure of vb3 has been changed strongly, so that could also be part of the problem.
i think we should wait for the new style, as i'm sure Kier doesn't use that much table tags anymore