How it works

Below is the config.yml file where you can change the speed values ​​manually

speedValue:
  # Default movement speed of the Happy Ghast when not ridden
  default: 0.05

  # Movement speed of the Happy Ghast when ridden by a player
  riding: 0.15

The speed range is from 0.01 to 0.5, the default speed of the Happy Ghast is 0.05

It is also possible to change the values ​​directly from the game using the commands.

To make the changes effective in game you will need to get on and off the ghast at which you want to set the new speed.