Elytra Optimizer

Elytra Optimizer detects players gliding with elytra above a safe speed threshold and predicts which chunks they will reach. It uses an adaptive forward cone that turns narrower while a player flies straight, and it issues short-lived chunk tickets so chunks load gradually rather than all at once. On long journeys the author reports that up to 80% fewer chunks get loaded, a number from the author's own text that has not been checked.

The mod skips chunks that are already loaded, so no work is repeated. It throttles its predictions when the server tick time exceeds 40 ms and disables them entirely above 50 ms, and it pauses when memory use passes 75%. On servers with less than 2 GB of RAM it enables a reduced Lite mode with a smaller cone and lower limits. If anything misbehaves, the server falls back to vanilla behavior immediately.

The logic runs on the server, so it also works in singleplayer because the integrated server runs it. Players do not need the mod installed. The version on this page targets Fabric for 1.20.4, is server-side only, and is released under the MIT License; the code is not open source.