NoRollback

NoRollback is a project that removes 99% (source : trust me) of rollbacks.

You can remove this project from a world after loading a world with it. One use is enough.

How it works ?

It sets the game rule elytra_movement_check and player_movement_check to false. This allowed to ignore the player's speed limit & speed limit when using elytra, removing most rollbacks at the cost of making easier to cheat on a server. (source : Minecraft Wiki - Gamerule)

Complementary

If you use this project, you might be interested by Eslium