That headline is <i>very</i> misleading.<p>The guy didn't just "rewrite" the game, he ported it to a completely different hardware!<p>The rewrite takes advantage of a separate CPU (the SA-1), so while the original was rendered entirely in software, his version is hardware accelerated. That hardly counts as a "rewrite" (which would imply that his code changes led to the speed-up), but an actual port to a different platform.<p>So it wasn't his code changes that are responsible for the performance increase, it's the use of additional dedicated hardware...