Consistent deathwarp: To get deathwarps to work consistently, you need to start your file on an exact frame, since this determines, which Harry get's to attack. Thanks to StarrlightSims (who did all the work basically :D ), there is now a method for lighting, which seems to be consistent. The method uses a flowtimer. You start the timer when hard resetting your console/emulator with the following offset values: On emulator: 14666 On Gameboy Player: 16566 And then just press A on your file on the last tick of your timer. Note that this setup is only 100% consistent for the hagrids hut lighting and the early deathwarp, if you save twice.

Early deathwarp: The early deathwarp is performed right after the sorting ceremony and saves about five seconds compared to the traditional route. With the early deathwarp come some changings in routing, which lead to the following route: -deathwarp to 4th floor, shortcut 4th -> 7th -talk to portrait, get aconite in 7th floor classroom -stairs to 5th floor, shortcut 5th -> dungeon -get tie in entrance hall -stairs to 1st floor, get wormwood in McGs office -deathwarp to 4th floor, shortcut 4th -> 6th -talk to Nick -go to common room on 7th floor, after sleeping, perform deathwarp to 4th -take stairs to 5th floor and get card combos

From there on the routes converge and you just continue with potion class. To show the route and the timesave gained of it, I added a video to show it of. The video shows a timesave of about eight seconds, but since this isn't tool assisted and just a quick runthrough I did, I'm not sure how precise it is, hence the afore mentioned five seconds.