Speed Swap

About
Speed Swap is a trick that takes advantage of the increased Z-axis speed that Mario, Peach, and Bowser experience. Movement speed left and right is 2.25 while movement speed up and down is 2.6775, a 19% speed difference. Speed Swap causes Mario's Z-axis speed to lock while moving left and right. This means that Mario will move faster than just holding left or right. Utilization of this glitch over a long period can save quite a lot of time due to faster movement, though it is not practical to try in Real Time Attack runs.

How It Works
There are two variations of a Speed Swap. The first variation only works with Mario because it requires the ability to jump. (Though Bowser can jump in the 2D stages, he doesn't have a Z-axis to walk on for increased speed.) This variation requires Mario to walk up or down for one frame, and jump left or right on the next frame. At this point, Mario's speed will be locked at 2.6775 instead of only 2.25. By performing frame perfect jumps after this point, Mario's speed will remain locked. The second variation of Speed Swap allows for the use of Mario, Peach, or Bowser. The player can walk up or down for a minimum of 2 frames. After this point, their Z-axis speed will be frozen for 14 frames. From here, the player can move left or right for 14 frames with increased speed. If using Mario, it's best to jump near the end of it. With Peach and Bowser, the fastest movement is to walk down or up for 2 frames, left or right for 14 frames, and then repeat.

Application
Speed Swapping is useful all throughout the run before Yoshi is obtained, due to the large amount of X-axis movement. Aside from general maneuvering, a few specific applications follow: The first application is using the second variation of speed swap to jump from the last platform after the Blooper fight to the platform with the Petal Meadows pipe. This skips waiting for the platform to move right. Second, the second variation can be used for Window Jump in Hooktail's Castle. Because the player will have enough speed to reach the window horizontally, the player can then focus on holding up to make it through the window.

Video Explaining Speed Swapping By Monado: https://www.youtube.com/watch?v=kW23vARr_4c&lc=UgxujAkews5I5d6ViHp4AaABAg