Kernel: fork and exec are really slow
Offshoot from #6021, a single call to fork() seems to take about 15ms (!) (at least, in the context of Shell).
An exec() call is also fairly slow, but not as slow as fork().
Here's a profile of running sleep 0 ten times in a loop (look at 1250-1658ms), where fork and exec together take up ~28% of the runtime: profile.tar.gz
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