High CPU usage

CPU is always at the limit in Statistics.

Something is doing too much work each tick: entities, farms, chunk generation or a plugin. Find it with spark, then reduce it or upgrade.

Before you start: spark installed (Plugins tab).

Step by step

1. Run spark profiler start, wait a few minutes during the high CPU, then spark profiler stop, and open the link.
2. Look at the top entries: entity ticking, a plugin name, world generation or redstone.
3. Chunk generation from exploring is a common cause: pre-generate the world (see that guide) and set a world border.
4. Lower simulation-distance to reduce how much of the world is active.
5. Remove or configure the heavy plugin shown by spark.
6. If the load is normal play and still maxed out, a larger plan gives more CPU (for example 8 GB = 600%).

Check it worked: CPU drops below the limit at busy times and TPS stays at 20.

Why it happens: The plan's CPU allowance is shared across the server's threads (100% = one thread); the main game loop mostly uses one.

More guides on RAM, CPU, performance, and lag:

• Find out why your server lags
• Out of memory errors
• RAM always shows high in the panel
• Too many entities, mob farms and item build-ups
• Redstone and hopper lag
• View distance and simulation distance