Google is probably migrating the "Old Forums" to the Groups right now. The Groups are exceptionally slow and you have to post things 2 or 3 times until they get through - you know I often post there too; kind of a "mission" I guess... π
"Scaleability"?
I wonder what improvements they are going to implement - but they haven't "warned" the Groups users about the changes yet.
Though there are maybe only about half a dozen regular posters there who cares - and they are regular visitors of the Pro Forums, too, so they might already know that something is happening...