When it comes to speedruns, mastering all the tricks and being consistent is going to take you pretty far. However, in every game there might be subtle things that can save time in the course of the run. They might not be very well documented, or they become apparent after playing the game for some time. Anatomyz has put together a video on some of the little timesavers that are widely used in general gameplay throughout any speedrun of Majora's Mask.
This spreadsheet shows the length of each textbox on each version of the game, the type of textbox, and the optimal mashing strategy.