> E.g. right now Plan 9 suffers from a *lot* of data copying between
> the kernel and processes, and between processes themselves.

Huh? What exactly do you mean? Can you describe the scenario and the
measurements you made?

> If we could eliminate most of that copying, things would get a lot faster.

Which things would get faster?

> Dealing with the security issues isn't trivial

what security issues?

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