GrimLag

SOON THERE WILL BE A FABRIC MOD FOR WHICH IT WILL BE FOR BOTH SINGLEPLAYER AND MULTIPLAYER COMPATIBLE. GrimLag Lag control that adapts instead of panicking.

GrimLag is a lag-aware, adaptive performance management plugin for Paper servers. It doesn’t spam clears, doesn’t nuke farms on sight, and doesn’t pretend lag is the players’ fault. It watches the server, decides how bad things really are, and responds accordingly.

Think damage control, not scorched earth.

What GrimLag Does Adaptive Lag Stages GrimLag continuously monitors server performance and shifts between four internal stages:

HEALTHY – Everything runs normally

WARNING – Light intervention begins

DEGRADED – Aggressive but fair throttling

CRITICAL – Survival mode

No hard switches. No instant punishment. The server eases into restrictions and eases back out.

Entity AI Throttling (With Recovery) When lag spikes, mob AI is selectively disabled to reduce CPU load. When performance recovers, AI is restored automatically.

Mobs don’t stay brain-dead forever. This isn’t a museum.

Spawner Rate Scaling Spawner output is dynamically scaled based on current lag stage.

Spawners slow down under load

Resume normal behavior when the server recovers

No global “off switch” rage-quits

Entity Birth Control GrimLag limits entity overpopulation per chunk, not globally.

Soft caps first

Hard caps only when needed

Players are never removed

Priority entities survive longer

Crowded chunks get handled without killing activity across the entire world.

Lag-Aware Redstone Throttling Redstone activity is dampened using probabilistic throttling during lag spikes.

Redstone still works

It just doesn’t fire every single tick when the server is on fire

Less lag, fewer broken contraptions

This is intentional sabotage. But polite.

Item Lifecycle Management Instead of nuking dropped items:

Items are merged where possible

Old items age faster under lag

Only then are excess items removed

Your server gets cleanup — not an extinction event.

Item Lifecycle Management Instead of nuking dropped items:

Items are merged where possible

Old items age faster under lag

Only then are excess items removed

Your server gets cleanup — not an extinction event.

Soft Recovery Logic As performance improves, GrimLag reverses its own restrictions:

AI returns

Spawners normalize

Redstone resumes full behavior

Despawn rules relax

Nothing stays throttled longer than necessary.

Design Philosophy Adapt, don’t panic

Throttle, don’t nuke

Recover automatically

Be predictable, not aggressive

GrimLag is built for long-running survival servers, not short-lived benchmarks.

Requirements Paper (recommended)

Java 17+