Killer, are you saying the new site loads faster or the existing one? The new site actually uses less bandwidth and reduces the size of the database which means quicker load times. I'm hoping to have a mobile friendly version of the new site for slow connections and/or mobile devices. Also, be aware the overhaul is not just updating the forums. There's other new stuff in the works. There will probably be a slight learning curve but as some one who's been using both systems for years, I've always preferred the new system we are moving too.
Once we are ready to flip the switch and move to the new forum/site, both sites will be taken down (should be less than an hour) to move all the data over again and redirect the old forums to the new ones. That said, there's also not really any reason not to update your bookmarks now as the first "topic" on the new site takes you right back to here.
Now is the time though to give whatever feed back you have. Play around with the new site as much as you want, make posts, etc. Just understand for the time being this is still the active site and anything you post on the new site will be wiped once we switch. I especially need to know ANY errors/oddities you experience on the new site. Even little things, an image not loading, a thread not displaying properly, etc.
Edit: Killer, I just updated your layout on your account. Does that one seem and faster/slower?