The irony here is you'd lose serious performance since you're not using sendfile(2).
"A portable sendfile [...], thanks to Marc Lehmann.
It's undocumented because it's an unstable API for now.
I wouldn't mind a contribution for a test/simple/test-sendfile.js" [1].
.
Also see Using sendfile(2) with NodeJS [2].
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[1]: http://comments.gmane.org/gmane.comp.lang.javascript.nodejs/...
[2]: http://blog.std.in/2010/09/09/using-sendfile-with-nodejs/