Okay, that sounds exactly like the experience I'm having now. I was hoping you'd had better performance with the internet streamed flash content. But if you're experiencing the same thing I am then I guess I haven't done anything wrong with my configuration.
Maybe I'll check out that "Square" Beta and let you know how it goes.
However, I'm seeing that's for the 64-bit flash version of the flash player. I don't suppose that'll fix anything if I'm running 32-bit Ubuntu.