'Perfect' Zelda NES Speed Record Beaten

An anonymous reader writes "The last verified human Legend of Zelda (NES) speed record was 34 minutes. A few months ago, a re-recording emulator was used to make a 'perfect' video which was 31 and a half minutes. A team worked to optimize the path, and using an emulator created a new video which is 26:56, four and a half minutes faster. The video is 14% faster, and is the first Zelda run to be under a half hour. Furthermore, it achieved a sub-27 minute time, which was presumed impossible. Definitely worth checking out - you can grab the BitTorrent version of the AVI replay at Bisqwit's NES time-attack movie page." There's a thread on the NESvideos forum discussing the attempt, but can anyone succinctly explain the exact tricks the team used to speed up their time?