Pause Jumping is done by rapidly inputting pause as you're jumping upward. The pausing skips gravity calculations, allowing you to jump higher. The pause autofire is typically done by holding pause on keyboard.

A controversial issue of Momodora 3 speedrunning is that Pause Jumping is not a consistent trick, especially across PCs. In extreme cases, some people are able to jump much higher than others and perform skips that are otherwise impossible for others. The current rules ban such skips and permit only those that most, if not everyone, can perform. A significant example of this is Prim Doralina's fight. Usually it's possible to skip her fight by Pause Jumping to the lower gap on the left. However, it's possible and faster for those with a much higher Pause Jump to leave via the right gap that was entered from.

To provide some measure, a fully held normal jump can consistently raise you by roughly 2 tiles of height, or more precisely 35 units when observed in Cheat Engine. Pause Jumping on the other hand actually isn't consistent but typically allows you to more or less double this height gain, with precise heights ranging as far as from 62 to 82 units (note: this is not to be a strict limit of what Pause Jumps should be, but rather a loose reference of what it could be).

It's also important to consider the amount of time it takes to perform a pause jump. Simply put, Pause Jumping commonly starts with a delay of 233 milliseconds after the first pause input. Afterwards, pauses are usually inputted on every other frame.

The following image details what happens during one case of a Pause Jump frame by frame. Note that this was observed from a 60 fps recording as opposed to the game itself. Frame 52 is notable in that the next pause input was conducted immediately afterwards as opposed to waiting one more frame. This typically occurs once per Pause Jump.

With JoyToKey set to an autorepeat of 16 times per second and a start delay of 233 milliseconds, this typically occurs 3 times per Pause Jump, resulting in a slightly higher height. Antimicro has yielded me worse results with ~5 times per Pause Jump at best.