Wow, that was fast ! Thanks Reggie for listening and acting on it... now the forums are blazingly fast on the 770.. :-)

Now, if I may push my luck I'd like to offer the following feedback :

The new pages are maybe a little *too* bare -- not visually, but in the sense that there is no indicator left anymore of which forums have new posts (in the forum list page), or in which threads those posts reside (in a forum's thread list page). This makes difficult if not impossible to follow the forum's activity...
If you recall that mobile version of vBulletin on the french site I posted up there, it has very bare pages also, with only two pictograms : a red check mark for forums with new posts, and a button-with-down-arrow for threads with new posts. Works very well in practice (also very useful : links to page numbers for those loooong MikeCane threads :-).

Another way of solving the issue is through the "new posts" query : after posting the first message I had taken to using it as my "entry page" to the forums through a bookmark -- it shows only what you need to catch up on and saves a lot of back-and-forth and page reloads.
Unfortunately in mobile mode there is no link to it anymore, and if you switch to it from classic mode it looks like it hasn't been "skinned" (ie it's a mess :-).

If the software can be tweaked a little bit along those lines I think the results will be just great.
TIA,
fp