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spark is a performance profiler for Minecraft clients, servers and proxies.

Created by Iucko



spark is a performance profiler for Minecraft clients, servers and proxies. 

(The version here on CurseForge is for Forge/Fabric only!)

Useful Links



spark is proudly sponsored by BisectHosting.​

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What does it do?

spark is made up of a number of components, each detailed separately below.


⚡ CPU Profiler

spark's profiler can be used to diagnose performance issues: "lag", low tick rate, high CPU usage, etc.

It is:

  • Lightweight - can be ran in production with minimal impact.
  • Easy to use - no configuration or setup necessary, just install the plugin/mod.
  • Quick to produce results - running for just ~30 seconds is enough to produce useful insights into problematic areas for performance.
  • Customisable - can be tuned to target specific threads, sample at a specific interval, record only "laggy" periods, etc
  • Highly readable - simple tree structure lends itself to easy analysis and interpretation. The viewer can also apply deobfuscation mappings.

It works by sampling statistical data about the servers activity, and constructing a call graph based on this data. The call graph is then displayed in an online viewer for further analysis by the user.


⚡ Memory Inspection

spark includes a number of tools which are useful for diagnosing memory issues with a server.

Heap Summary - take & analyse a basic snapshot of the servers memory

  • A simple view of the JVM's heap, see memory usage and instance counts for each class
  • Not intended to be a full replacement of proper memory analysis tools. (see below)

Heap Dump - take a full (HPROF) snapshot of the servers memory

  • Dumps (& optionally compresses) a full snapshot of JVM's heap.
  • This snapshot can then be inspected using conventional analysis tools.

GC Monitoring - monitor garbage collection activity on the server

  • Allows the user to relate GC activity to game server hangs, and easily see how long they are taking & how much memory is being free'd.
  • Observe frequency/duration of young/old generation garbage collections to inform which GC tuning flags to use


⚡ Server Health Reporting

spark can report a number of metrics summarising the servers overall health.

These metrics include:

  • TPS - ticks per second, to a more accurate degree indicated by the /tps command
  • Tick Durations - how long each tick is taking (min, max and average)
  • CPU Usage - how much of the CPU is being used by the server process, and by the overall system
  • Memory Usage - how much memory is being used by the process
  • Disk Usage - how much disk space is free/being used by the system

As well as providing tick rate averages, spark can also monitor individual ticks - sending a report whenever a single tick's duration exceeds a certain threshold. This can be used to identify trends and the nature of performance issues, relative to other system or game events.



To install, just add the .jar file to your mods directory.

Information about how to use commands can be found in the docs.

If you’d like help analysing a profiling report, or just want to chat, feel free to join us on Discord.



There are a few small "guides" available in the docs, covering the following topics.


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What means Verified?

  • Compatibility: The mod should be compatible with the latest version of Minecraft and be clearly labeled with its supported versions.
  • Functionality: The mod should work as advertised and not cause any game-breaking bugs or crashes.
  • Security: The mod should not contain any malicious code or attempts to steal personal information.
  • Performance: The mod should not cause a significant decrease in the game's performance, such as by causing lag or reducing frame rates.
  • Originality: The mod should be original and not a copy of someone else's work.
  • Up-to-date: The mod should be regularly updated to fix bugs, improve performance, and maintain compatibility with the latest version of Minecraft.
  • Support: The mod should have an active developer who provides support and troubleshooting assistance to users.
  • License: The mod should be released under a clear and open source license that allows others to use, modify, and redistribute the code.
  • Documentation: The mod should come with clear and detailed documentation on how to install and use it.

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How to Install


Download Forge & Java

Download Forge from the offical Site or here. If you dont have Java installed then install it now from here. After Downloading Forge you can run the file with Java.



Lounch Minecraft and select your Forge istallation as Version this will create a Folder called Mods.


Add Mods

Type Win+R and type %appdata% and open the .minecraft Folder. There will you find your Folder called Mods. Place all Mods you want to play in this Folder



You are now Ready. Re-start your Game and start Playing.

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