Elytra Optimizer
A mod that aims to fix slow chunk generation while using elytra.
Why Elytra Optimizer?
Large multiplayer servers often stall when several players fly with elytra. Those stutters are the server choking on sudden chunk requests. Elytra Optimizer is a conservative Fabric server mod that smooths those bursts without changing gameplay.
How it works
- Detects players in elytra flight with a safe speed threshold.
- Predicts chunks ahead using an adaptive cone (45° when turning, narrows to 5° during straight flight—up to 80% fewer chunks loaded on long journeys).
- Issues short-lived chunk tickets so those chunks load gradually instead of all at once.
- Automatically throttles predictions when MSPT exceeds 40ms, disables entirely above 50ms.
- Pauses when memory usage exceeds 75% to prevent out-of-memory issues.
- Auto-enables "Lite mode" on servers with less than 2GB RAM (reduced cone, fewer chunks, lower limits).
- Skips chunks that are already loaded—no wasted work.
- Falls back to vanilla instantly if anything misbehaves.
Compatibility
Plays nicely with the Fabric optimization stack: C2ME, Lithium, Starlight, FerriteCore, Krypton, ModernFix, Noisium. Detects and supports modded flight from Origins, Create, Colytra, Trinkets, Curios, and Caelus API.
Commands
/eo stats— TPS, memory, flying players, active tickets at a glance. Shows active modes (Lite, Conservative) and warns when resources are low./eo toggle— disable without restart when things get busy./eo debug— per-player flight details: straight-flight distance, current cone angle, ticket count./eo reload— re-detect installed mods after changes.
Technical details
Uses primitive collections (fastutil), pre-computed trig tables, squared distance comparisons, and thread-local buffers. Targets under 50 microseconds per player per tick with zero GC pressure. Tickets expire after 5 seconds; stale tickets are cleaned up immediately on direction changes.
Dependencies
- Fabric API
All logic runs server-side (works in singleplayer too because it's just an integrated server). Players don't need the mod installed. Minimal config, fewer lag spikes when everyone takes to the skies.
