Elytra Speed Cap

A lightweight mod that limits the maximum speed of elytra flight to a configurable value.

Works in both singleplayer and on a dedicated server, with an optional client-side mod that offers additional improvements for players.

Ideal for multiplayer servers that want to nerf elytra rushing, reduce chunk-loading lag, or balance late-game travel.

Why Use This Mod?

1. Performance Boost:
   Prevents high-speed elytra flight from overwhelming your server's chunk loader while being designed to be very lightweight.
2. Comprehensive Coverage:
   Works with every kind of boosting: Vertical boosting, rocket boosting and even when boosting your flight via a riptide trident.
3. Fairness:
   Makes fast travel more balanced without disabling elytras altogether.
4. Flexible:
   The server-side mod prevents all players, including those without it, from flying faster than the configured speed, allowing vanilla setups to join seamlessly. The client-side mod enhances the flying experience, making it smoother.
5. Compatible:
   It's fully compatible with modded setups right out of the box. Like for example, the popular mod Do a Barrel Roll.

How It Works

Minecraft calculates elytra flight server-side, while the client predicts motion locally.
To enforce a maximum speed cap:

• Server Side:
  Caps player velocity when exceeding the configured speed.
• Client Side (optional):
  Syncs the flight prediction to prevent visual stutter or lagging back.

Note:
Without the mod on the client, players might snap back (lag back) because the server corrects their velocity when exceeding the cap.
Server owners should encourage players to install the mod for a smoother experience.

Configuration

A config file is created at:

./config/elytra-speed-cap.json

Default contents:

{
  "max_speed": 60.0
}

• max_speed: Maximum allowed elytra speed in blocks per second.
• After editing, restart the server/game to apply changes.

Showcase

The max speed is set to 10 blocks per second.

Rocket Boosting: Measured in-game speed is 9.90 blocks per second.

Riptide Trident: Measured in-game speed is 9.99 blocks per second.

Contributing & Issues

I warmly welcome:

• Bug reports
• Feature requests
• Pull requests

Please open issues or PRs on GitHub.

License

This project is licensed under the LGPLv3 License. See LICENSE for details.