Doesnt android run heavier than maemo6/meego harmattan though? When speaking of processors, I mean.

From my end view as a user, the N9 is at least as fast as the SGS2 in use. SGS2 does have H+ connection, but N9 has a stronger connection normally where the SGS2 would flat out or revert to edge.

As for fast, the N9 is pretty damn good at multitasking and being fast. Its kind of its thing.

Operating with several tasks is far easier with the N9 than my SGS2. FAR easier.

Not sure about ICS multitasking/appswitching, but ICS is something Id consider only on a phone that runs it from the get-go. IE no spacewasting frontbuttons like on SGS2 and SGN.

Ive never felt appswitching with more ease than the N9.