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[racket] Computer Language Benchmark Game

From: namekuseijin (namekuseijin at gmail.com)
Date: Thu Feb 16 15:25:33 EST 2012		 
Looking at:
http://shootout.alioth.debian.org/u64q/program.php?test=spectralnorm&lang=racket&id=3

I stumbled upon this:

;; the big let improves performance by about 20%
(let* ()
  ... various defs...)

bizarre... why?  And is it still true?

BTW, this:

http://shootout.alioth.debian.org/u64q/program.php?test=pidigits&lang=racket&id=2

seems to be measuring gmp performance rather than racket's...
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