From: jcb@... (MetalOne)
Date: 2002-11-22T06:56:02+09:00
Subject: Re: Ruby is too slow

> 
> > size.times { |i|
> > 	image[i] = lookup[image[i]]
> > }
> 
> One function call per pixel for the loop and 3 function calls for the
> lookups.
> 

hmmm.
Actually, I tried replacing the iterator with a while loop.
i = 0
while i < size
    image[i] = lookup[image[i]]
    i += 1
end

The while loop version was slower yet.
A function call to index an array?  Yikes!  Well, that might explain it.