title: What are the most hardcore optimisations you've seen?
body: <p>I'm not talking about algorithmic stuff (eg use quicksort instead of bubblesort), and I'm not talking about simple things like loop unrolling.</p>
  
  <p>I'm talking about the <em>hardcore</em> stuff. Like <a href="http://www.muppetlabs.com/~breadbox/software/tiny/teensy.html" rel="noreferrer">Tiny Teensy ELF</a>, <a href="http://catb.org/jargon/html/story-of-mel.html" rel="noreferrer">The Story of Mel</a>; practically everything in the demoscene, and so on.</p>