Since the update, the forum has had times where the speed has been slow. We are a aware of this issue and are continuing to make tweaks and changes to the forum to fix the speed issues.
At this time, we've even brought in the vBulletin support folks to help identify what the issues are so as to get the forum back up to an acceptable level of speed.
Thank you everyone for the feedback on this (and other) issues. I wanted to make this post so that you would know we are still continuing to work on this issue.
I'll update this thread as I learn more on what is happening regarding the speed issue. Please use the other thread for any other forum issues.