"Can't Keep Up! Minecraft Server Message"

That console warning — “Can’t keep up! Is the server overloaded? Running X ms or Y ticks behind” — means your server can’t finish processing a tick before the next one starts. In plain terms: it’s lagging. Below is what drives this and the levers you have to pull.

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Understanding TPS

Minecraft servers run on a tick loop, targeting 20 Ticks Per Second (TPS). When a server can’t hit that target, every connected player feels it — regardless of their own hardware or connection. Run /tps on Paper or Spigot to check your current rate. Running a modded server instead? TPS alone won’t tell you much — install spark to profile exactly where the time is going. Rough guide to what the numbers mean:

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Common Root Causes

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Memory Pressure

If your server is starved for RAM, performance suffers. Every loaded plugin, mod, and connected player takes up memory — run out, and the server has nowhere to put that data, so it stalls. Check current usage from the Console page of your panel. If you’re consistently near the ceiling, enabling the Aikar startup flags from the Startup page can help the JVM manage memory more efficiently.

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World and Entity Load

A handful of in-game conditions tend to be the biggest tick-time offenders:

• Entity overload — Dense mob farms or large piles of dropped items pile up entities in one chunk, and the server has to tick each one. Clean up with:

  Command	What it does
  kill @e[type=minecraft:item]	Clears dropped items only
  kill @e[type=minecraft:ENTITY_NAME]	Removes a specific entity type (swap in the entity’s ID)
  kill @e[type=!player]	Wipes every entity except players — use with care

• Hopper spam — An uncovered hopper continuously scans for nearby item entities even with nothing to collect. Cap it with a chest or any inventory block on top and the scanning stops.
• Fluid simulation — Large, actively-flowing bodies of water or lava generate constant block updates, which adds up fast at scale.
• Chunk generation — Rendering brand-new terrain on the fly is expensive, and worse with heavier world-gen mods. Pre-generating the map with Chunky shifts that cost to a controlled batch job instead of live gameplay.

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Quick Wins to Cut Lag

• Reduce view distance
• Reduce simulation distance
• Pre-generate the world with Chunky
• Tune your startup flags
• Tune mob spawn rates (Paper/Spigot only)
• Trim memory usage (Paper/Spigot only)