--- title: "Minecraft Can't Keep Up Warning: Causes and Fixes | ZCS" description: "Understand Minecraft's Can't Keep Up warning, MSPT and TPS, and find whether world generation, entities, plugins or hardware cause slow ticks." url: "https://www.zcraftstudios.com/blog/minecraft-server-cant-keep-up-warning-fix" updated: "2026-10-20T07:22:11.764657+00:00" source: "ZCraft Studios" --- > Site index for AI agents: https://www.zcraftstudios.com/llms.txt (full reference: https://www.zcraftstudios.com/llms-full.txt). Every page is available as Markdown by adding `.md` to its URL or sending `Accept: text/markdown`. 1. [Home](https://www.zcraftstudios.com/) 2. [Blog](https://www.zcraftstudios.com/blog) 3. Minecraft Can't Keep Up Warning: Causes and Fixes [ All posts](https://www.zcraftstudios.com/blog) # Minecraft Can't Keep Up Warning: Causes and Fixes ZCraft StudiosOct 15, 2026Updated Oct 20, 2026 Understand Minecraft's Can't Keep Up warning, MSPT and TPS, and find whether world generation, entities, plugins or hardware cause slow ticks. ## In this guide - [What the warning means](#what-the-warning-means) - [Understand the tick budget](#understand-the-tick-budget) - [Collect evidence under actual load](#collect-evidence-under-actual-load) - [Interpret common patterns](#interpret-common-patterns) - [Change one variable at a time](#change-one-variable-at-a-time) - [Do not assume RAM is the answer](#do-not-assume-ram-is-the-answer) - [Verify the improvement](#verify-the-improvement) - [What the numbers mean](#what-the-numbers-mean) - [Common causes and first checks](#common-causes-and-first-checks) - [Related reading](#related-reading) ## Minecraft Server 'Can't Keep Up!' Warning: What It Means and How to Diagnose It ## What the warning means The message `Can't keep up! Is the server overloaded?` indicates that the server's execution is running behind expected timing. It does not, by itself, identify the reason. A single warning during initial generation can be very different from recurring warnings whenever players join. ## Understand the tick budget At 20 ticks per second, one tick has a 50-millisecond budget. If the server consistently needs more than that for game work, it cannot sustain the target tick rate. TPS is an outcome; **MSPT** helps show how much tick work is taking. Client FPS and network ping are separate measurements. ## Collect evidence under actual load Record server version, Java runtime, player count, loaded chunks and simulation settings. Use a compatible profiler such as [spark](https://spark.lucko.me/) while the slowdown is occurring. Keep the report and a short change log so you can compare conditions later. ## Interpret common patterns | Pattern | Check | | --- | --- | | Slowdown during new exploration | Chunk generation and disk/CPU workload | | Slowdown near player farms | Active entities, hoppers and redstone | | Slowdown after plugin update | Main-thread tasks and version compatibility | | Slowdown only during backups | Disk contention and snapshot scheduling | | Bad latency but normal MSPT | Network path rather than tick overload | ## Change one variable at a time On staging or during a controlled maintenance period, test adjustments such as simulation distance, world pregeneration and plugin scheduling. Verify whether a change affected player experience as intended. A smaller simulation distance can reduce workload but also alter gameplay; explain that trade-off to the community. ## Do not assume RAM is the answer Insufficient heap can cause garbage collection or memory failures, but plenty of memory does not guarantee fast ticks. If a profiler identifies expensive simulation code, allocating more memory may change little. If the host kills the process, diagnose memory separately. ## Verify the improvement Compare MSPT and warning frequency during similar activity before and after the change. Record the player count and event type. Avoid declaring a fix based on a quiet five-minute interval when the original symptom occurred only during a large event. ## What the numbers mean | Term | Meaning | | --- | --- | | TPS | Ticks per second. A healthy server runs at 20 | | MSPT | Milliseconds per tick. It must stay under 50 to hold 20 TPS | | Tick budget | 50 ms to finish all game logic each tick | The warning appears when the server cannot finish a tick within its budget, so it falls behind. It usually means one thing is taking too long, not that the whole server is too small. ## Common causes and first checks | Cause | How to check | | --- | --- | | Too many entities | Count mobs and item entities by chunk; check spark for entity ticking | | A slow plugin | Profile with spark and look for plugin names high in the server thread | | Chunk generation | Players exploring new terrain; consider [pregeneration](https://www.zcraftstudios.com/blog/minecraft-world-pregeneration-launch-guide) | | Autosave or backups | Lag spikes on a schedule; check [backup timing](https://www.zcraftstudios.com/blog/minecraft-server-backup-strategy) | | Slow disk | High I/O wait; see [sync-chunk-writes](https://www.zcraftstudios.com/blog/sync-chunk-writes-server-properties) | | Weak CPU | Main thread pinned while other cores idle; see [Dedicated Server vs VPS](https://www.zcraftstudios.com/blog/minecraft-dedicated-server-vs-vps) | ## Related reading - [Fix Minecraft Server Lag](https://www.zcraftstudios.com/blog/reduce-minecraft-server-lag) - [World Pregeneration](https://www.zcraftstudios.com/blog/minecraft-world-pregeneration-launch-guide) - [Minecraft RAM and Java Errors](https://www.zcraftstudios.com/blog/minecraft-java-heap-ram-errors) - [Aikar's Flags Explained](https://www.zcraftstudios.com/blog/aikars-flags-performance-tuning) ## Continue reading - [Can You Change a Minecraft Server Seed Without Losing Builds?](https://www.zcraftstudios.com/blog/minecraft-seed-existing-server-change) - [Server Resource Pack Download Failed: URL and SHA-1 Fixes](https://www.zcraftstudios.com/blog/minecraft-resource-pack-download-failed-fix) - [Minecraft Whitelist Not Working? Fixes for Access Errors](https://www.zcraftstudios.com/blog/minecraft-server-whitelist-not-working) - [A Minecraft Server Backup Script You Can Actually Set Up Today](https://www.zcraftstudios.com/blog/minecraft-server-backup-script-guide) [ Previous guide Minecraft Whitelist Not Working? Fixes for Access Errors](https://www.zcraftstudios.com/blog/minecraft-server-whitelist-not-working)[ Next guide Minecraft RCON Explained: Errors and Security Checklist](https://www.zcraftstudios.com/blog/minecraft-server-rcon-security-guide)