tha_con, I didn't encounter much slowdown in Home. LBP 4P co-op could slow to 1-2fps when joining a game. Early R2 closed beta was sluggish too. Home framerate seems okay so far. I only encountered brief stutter when 20+ people were around doing assorted things.
As expected, I take issue with other aspects in the beta. Will discuss in the beta forum ;-)
Maybe we're playing different versions of both games!
I don't know, I never really ran into problems with R2 at all, and I logged about 25 hours into Co-op alone.
I seemed to run into problems in Home under the same circumstances, with around 20 people on screen. But I mean, really, when it launches, that will be common place, and I expect it to pretty much run like that all the time in public spaces.
Not to mention going into someones home space for an R2 game with a group of 30...it could be pretty rough