This mod enables fine grained control over your flight speed. Useful for changing your speeds when flying around beyond the built-in fast mode toggle.
Passing the /flyspeed command a decimal number multiplies the current flight speed (e.g. 1.5 means 150%, 2 means 200%). It will save this value between multiple joins and is saved per-player.
Known issues
The mod tries to detect if you're flying and only applies the speed if you are flying. As the client can't trustworthily report if it is in a (legal) flying mode it works about as well as a fly anti-cheat.