I'm not sure why you think process start-up is such a heavyweight operation. Of course there's lots of optimization for start-up, it's the whole basis for Unix.

I'm not sure why you think process start-up is such a heavyweight operation. Of course there's lots of optimization for start-up, it's the whole basis for Unix. A context switch is O(10000) cycles and 10k is totally doable. I agree that the Isolate architecture is more efficient, I just object to the straw man comparison. (And would love some real data.)