Initially and for standard use it's more or less snappy on my machine.
When I have 10+ RT tracks loaded in mixer and load 2-3 heavy duty plugins, I begin to notice slight pauses in audio at time when changing controls / parameters "live"- while playback occurs. But if I don't' touch parameters in live scenario, it seems fine, on heavier projects.

Can you try to explain more in detail of what you are experiencing? At time of playback? Picker(s)? Transport buttons? Screen freezes, but playback continues? Any errors popping up?