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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Speeding up exit(2)?
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>> it swapped a lot, then wrote "end" and immediately exited.
>
> Hmmm... yes, it's strange. With malloc-ed space, exit is also very
> fast. On a 2 GB machine with amd64, exit is almost immediate:

try mallocing 2 million times 2 kilobytes and fill.

maybe exit first free all malloc'ed space which is definitely nonsense.

>
> If I find a way to isolate the problem, I'll post it here.

maybe your problematic program uses atexit and exit actually calls part of 
it?