Knockback Optimizer

Knockback is normally calculated by the server and sent back to the player, which can make a hit feel delayed on a laggy connection. The mod predicts the knockback on the client so that the movement appears at once, and then the result is adjusted to stay close to what the server computes. Armor, shield, attribute and enchantment effects such as Blast Protection, Feather Falling and Knockback Resistance are taken into account in that prediction.

The mod includes presets that change several of its settings together, from a heavier and more accurate mode to a lighter and faster one. Players can also adjust the settings by hand to suit their connection and preference. Its visuals are close to the server result, though not identical in every case, so the settings may need some tuning.

Installation is client-side only: the server does not need the mod and players join without it. It is published for Fabric alone, across 12 game versions 1.21 – 1.21.11, under All rights reserved, so it is not open source. Server owners should check whether a server allows it before a player uses it, and the author advises testing it before relying on it.