The Killd Board / Wardens
How many wardens does it take to crash a Minecraft server?
1,912. That is the point where our test server stopped keeping up with its own tick loop, and only the ender dragon has managed it with fewer. We kept spawning until 12,311, at which point the server died outright.
Paper 1.21.11 · AMD Ryzen 7 9700X · 6GB allocated
Why wardens cost so much
A warden carries more per-tick work than anything else in the game. It listens for vibrations through the sculk system, which means every movement, block change and sound near it is a signal it has to evaluate. On top of that it runs the standard mob brain: pathfinding, target selection, goal ticking, collision. Most mobs do one of those things badly. The warden does all of them, and it does them while actively hunting. Two thousand of them in one chunk is roughly the same tick cost as tens of thousands of cheaper entities.
How we tested it
Everything spawned into a single chunk, in one pile, with the server left running until the tick rate gave up. The server ran Paper 1.21.11 on an AMD Ryzen 7 9700X with 6GB allocated, which is the same hardware and the same RAM policy as an ordinary Hostd plan. We watched TPS and tick times rather than guessing, wrote down the count where the server first fell behind, and kept spawning until it either died or made it clear it was not going to.
You will never have two thousand wardens. You might have one deep dark area that a chunkloader keeps ticking, and that is enough to be worth checking if your TPS dips at the same place every time.
What this means for your server
If your own server is printing Can't keep up! Is the server overloaded? the cause is the same shape as this one: something in the tick loop is taking longer than its 50ms budget. Roastd reads your RAM allocation, view distance, player slots, JVM flags and logs and names which of those it is. No account, no world upload, no charge.
Questions about wardens
Why are wardens so laggy in Minecraft?
Because a warden is three expensive systems in one mob. Sculk vibration listening evaluates nearby events every tick, the anger and target tracking keeps a list of who it is annoyed with, and the pathfinding is run on a large mob that has to navigate around obstacles. Ordinary hostile mobs skip most of that.
Can a warden crash a server on its own?
No. One warden is fine, and so is a deep dark biome with the handful the game spawns naturally. It took 1,912 in a single chunk before the tick rate slipped. What does cause real problems is a farm or a chunkloader keeping a large sculk area ticking permanently while nobody is there to see it.
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Rent the machine we keep breaking
Same AMD Ryzen 7 9700X, same hard-reserved RAM, same NVMe. Yours will not have 12,311 wardens in one chunk, which gives it a considerable head start. Online in under a minute, with a free address, DDoS protection and a 7-day money-back guarantee.