DexterFixInputLag

• Server-side Fabric mod for Minecraft 1.20.1 that targets Java 21+.
• Disables packet compression and enables TCP_NODELAY on every player connection to cut input latency.
• Flushes each player's network channel every tick so movement and rotation packets are delivered as soon as they are queued.
• Sends a short join message letting players know the low-latency mode is active.

Usage:

• Drop the JAR into your server's mods folder and start the server normally.
• Works with vanilla clients; no client installation required.

Notes and limitations:

• Compression is turned off to prioritize responsiveness, so bandwidth usage can rise on busy servers.
• The mod cannot change client-side mouse handling directly; the sharper feel comes from reducing network-side buffering and smoothing.
• If a proxy sits in front of the server, ensure it allows TCP_NODELAY and respects compression settings for the full effect.