Benchmark Report
Tick spikes · Mob AI
The worst ticks are several times the mean. Average TPS stays fine while players feel the stutter.
- mspt_avg = 185.4 ms
- mspt_p99 = 585.58 ms
- spike_ratio = 3.16 ratio
- sample_count = 114 count
Weakest test: Mob AI, 6.33 TPS on average. The 15 other tests hold at least 19.69 TPS.
Compared with other servers
The comparison with other servers uses reports scored with version 8.3.0 of the scoring rules. This report was scored with another version, so its score is not comparable.
What matters
Read from the measurements, never estimatedTick spikes
The worst ticks are several times the mean. Average TPS stays fine while players feel the stutter.
- mspt_avg = 185.4 ms
- mspt_p99 = 585.58 ms
- spike_ratio = 3.16 ratio
- sample_count = 114 count
Tick spikes
The worst ticks are several times the mean. Average TPS stays fine while players feel the stutter.
- mspt_avg = 28 ms
- mspt_p99 = 57.95 ms
- spike_ratio = 2.07 ratio
- sample_count = 93 count
›+2 more findings
memorynot measuredNo access latency was published, so the score assumed an unfavourable one. Publishing the measurement can only help.
- assumed_latency_ns = 180 ns
- reference_latency_ns = 120 ns
disknot measuredDirect IO was refused by the host, so the random part of the disk score rests on an assumption rather than a measurement.
- assumed_random_mbps = 90 MB/s
- reference_random_mbps = 150 MB/s
A finding stays silent rather than attribute a cause without evidence. An absent cause is an answer, not an omission.
Test by test
Problems first — select a row for the full test- Mob AIEntities6.33UnstableCritical
- Network (NBT)Network19.89UnstableUnstable
- Chunk LoadingExploration19.69ModerateHealthy
- RedstoneSingle-Core Stress19.91UnstableHealthy
- Disk PerformanceMemory & Storage19.94StableHealthy
- HopperMechanics19.98StableHealthy
- Block PhysicsSingle-Core Stress19.99ModerateHealthy
- Chunk TickingExploration19.99StableHealthy
- Bone Meal GrowthMechanics20.00StableHealthy
- ExplosionMechanics20.00StableHealthy
- Lighting UpdateExploration20.00StableHealthy
- Memory PerformanceMemory & Storage20.00StableHealthy
- Multi-Core CPUCPU20.00StableHealthy
- Single-Core (tick-aligned)CPU20.00StableHealthy
- Ticking Tile EntitiesMechanics20.00StableHealthy
- World SaveMechanics20.00StableHealthy
Settings your measurements justify
Each setting below is triggered by a measurement from this report, and names the test to replay to find out whether it helped.
Shrink the monster activation range
world-settings.default.entity-activation-range.monsters: 24Measured : mobAI.mspt.avg 185.4 ms (threshold 35.0 ms)
Mob AI costs more per tick than the budget allows. The activation range decides how far from a player a monster keeps thinking; shrinking it puts distant ones to sleep without removing them.
Test to replay : mobAI
Lower the monster spawn limit
spawn-limits.monsters: 50Measured : mobAI.mspt.avg 185.4 ms (threshold 50.0 ms)
Mob AI is past the critical cost per tick, where shrinking the activation range is no longer enough. The spawn limit caps how many monsters exist per player at all, which is the only setting here that reduces the work rather than deferring it.
Test to replay : mobAI
These settings trade a little gameplay fidelity for tick budget. Apply one at a time and replay the named test: the effect stays a hypothesis until you have measured it.
Briefing for a language model
Paste this into the assistant of your choice to have it rewritten in prose. It already carries every number, so the model has none left to invent.
{
"format": "voxelbench.tuning.v1",
"instruction": "Rewrite each recommendation below as plain prose for a server operator. Every number you are allowed to use is already in this document: the measured value, its threshold, and the proposed setting. Do not compute, estimate or predict any other number, and never state an expected gain. Keep every setting name and value exactly as written.",
"server": {
"type": "purpur",
"minecraft": "1.21.11",
"java": "25.0.3"
},
"recommendations": [
{
"id": "spigot.portee-activation-monstres",
"family": "spigot",
"measure": "mobAI.mspt.avg",
"value": 185.4,
"unit": "ms",
"threshold": 35,
"control_test": "mobAI",
"file": "spigot.yml",
"setting": "world-settings.default.entity-activation-range.monsters",
"proposed_value": "24",
"current_value": null
},
{
"id": "bukkit.limite-monstres",
"family": "bukkit",
"measure": "mobAI.mspt.avg",
"value": 185.4,
"unit": "ms",
"threshold": 50,
"control_test": "mobAI",
"file": "bukkit.yml",
"setting": "spawn-limits.monsters",
"proposed_value": "50",
"current_value": null
}
]
}Java start-up line
The options this server was started with, checked against its Java version. Corrections fix what is certainly wrong; leads to test are settings to measure, never applied for you.
Current line (5 arguments)
Values of system properties, agents and file paths are never shown: they appear as <redacted>.
-Xms128M -Xmx3072M --add-modules=jdk.incubator.vector -Dterminal.jline=false -Dterminal.ansi=true
Nothing to correct: every option is valid for Java 25.
To test
Performance settings to try one at a time, then measure with a benchmark before and after. None of them is applied in the corrected line, and none comes with a promised gain.
Settings documented by PaperMC for Minecraft servers: they size G1's young generation for the game's very high allocation rate and start collections earlier. Initial and maximum heap at the same size, with AlwaysPreTouch, commit the whole heap at start-up: proposed only because that heap already stays under the memory limit.
-Xms3072M -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1No measurement of this run points to it: it stays a lead to measure.
sourceRe-run and compare
- Apply the corrected line where your server starts (panel start-up parameters, start.sh).
- Restart the server.
- Run a new benchmark:
/bench start - Compare the new report with this one.
This report is the before; add the new report to the comparison once it is in. A single run on each side says little: the gap between two runs of an unchanged server is noise.
Every measurement
Each test in full. Tests in trouble are open; the others fold to their summary line.
Single-Core Stress
RedstoneHealthy19.91 TPS32.8 ms33.5s
Single-core stress via intensive redstone circuit updates.
- Heavy garbage collection79 collections, 1145ms total
Percentiles and stability
Raw data (3 fields)
Block PhysicsHealthy19.99 TPS22.7 ms20.7s
Single-core stress via falling-block physics.
- Heavy garbage collection16 collections, 974ms total
Percentiles and stability
Raw data (4 fields)
Exploration
Chunk LoadingHealthy19.69 TPS4.4 ms15.1s
Chunk generation and loading speed across dispersed zones.
- Heavy garbage collection24 collections, 2760ms total
Percentiles and stability
Raw data (2 fields)
Chunk TickingHealthy19.99 TPS21.9 ms41.4s
Server performance when ticking many loaded chunks with random tick updates.
- Heavy garbage collection23 collections, 1129ms total
Percentiles and stability
Raw data (3 fields)
Lighting UpdateHealthy20.00 TPS3.6 ms24.8s
Lighting recomputation throughput on block place / break.
- Heavy garbage collection5 collections, 379ms total
Percentiles and stability
Raw data (2 fields)
Entities
Mob AICritical6.33 TPS185.4 ms27.7s
Complex mob AI behaviours (villagers, iron golems, hostile mobs).
- Unfiltered samples usedUsing unfiltered samples (filter rate: 96%)
- Heavy garbage collection30 collections, 1360ms total
- The run did not hold steadyTPS avg=6.33<19, TPS P1=5.00<15, TPS StdDev=3.20>2
Percentiles and stability
Raw data (12 fields)
Mechanics
HopperHealthy19.98 TPS3.2 ms19.0s
Intensive hopper chain item transfers.
- Heavy garbage collection11 collections, 871ms total
Percentiles and stability
Raw data (2 fields)
ExplosionHealthy20.00 TPS4.7 ms17.4s
Massive TNT explosions and block destruction.
- Heavy garbage collection12 collections, 910ms total
Percentiles and stability
Raw data (2 fields)
Ticking Tile EntitiesHealthy20.00 TPS3.2 ms36.5s
Many ticking tile entities (furnaces, hoppers, etc.).
- Heavy garbage collection3 collections, 797ms total
Percentiles and stability
Raw data (2 fields)
World SaveHealthy20.00 TPS2.4 ms4.8s
World save speed and TPS impact during save operations.
- Heavy garbage collection3 collections, 549ms total
Percentiles and stability
Raw data (2 fields)
Bone Meal GrowthHealthy20.00 TPS2.6 ms22.1s
Rapid crop and tree growth via bone meal.
- Heavy garbage collection1 collections, 231ms total
Percentiles and stability
Raw data (8 fields)
CPU
Single-Core (tick-aligned)Healthy20.00 TPS4.1 ms10.0s
Single-thread compute throughput measured on the main thread under the tick scheduler.
- Heavy garbage collection2 collections, 389ms total
Percentiles and stability
Raw data (3 fields)
Multi-Core CPUHealthy20.00 TPS3.2 ms30.4s
Parallel computation throughput across worker threads.
- Heavy garbage collection4 collections, 241ms total
Percentiles and stability
Raw data (3 fields)
Memory & Storage
Memory PerformanceHealthy20.00 TPS2.2 ms77.9s
RAM bandwidth and latency.
JVM measurements — do not reflect actual bare-metal performance.
- Heavy garbage collection13 collections, 1017ms total
Percentiles and stability
Raw data (2 fields)
Disk PerformanceHealthy19.94 TPS3.1 ms48.3s
Sequential and random 4K read/write performance.
JVM measurements — do not reflect actual bare-metal performance.
- Heavy garbage collection47 collections, 1014ms total
Percentiles and stability
Raw data (3 fields)
Network
Network (NBT)Unstable19.89 TPS28.0 ms20.4s
Serialisation throughput — proxy for the rate at which the server can ship world data to clients.
- Heavy garbage collection38 collections, 389ms total
Percentiles and stability
Raw data (2 fields)
›Machine and serverAMD Ryzen 9 7950X 16-Core Processor · Purpur · 1.21.11
Score Breakdown
Detailed sub-category scores