Right me if I'm wrong but this is how I understand it:
Bitbridge plugins can't be docked into multidock since they are separate
processes and not truly "one with Sonar".
They talked a bit about this during the NAMM Live session.
http://www.youtube.com/watch?v=XTysXLBiYqY ..Around 9:13.
I'm guessing this is the reason why screensets might get a bit slower
with bitbridge as well.. More processes to handle