spark
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spark

By luckoOwner , Iucko
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2 reviews (100%) · 5.0★
0.5★ 5★

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

No Theme
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Server Utility
Mod Loaders
Forge
NeoForge
Fabric
Quilt
Minecraft
26.2
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5.0

Comprehensive Server TPS Info!

Puppydaze

Reputation ranks

Explorer 0 pts
Contributor 100 pts ←
Guide 500 pts
Veteran 1,500 pts
Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks
Total 1,000 hrs MC 1.21, 1.2… MC 1.21, 1.20
The version(s) the reviewer played
Performance
5.0

For anyone who plays extensively stressful Minecraft modpacks, this is a requirement! It's very common for servers (and single-player worlds) to start lagging under heavy loads when featuring heavy usage of tech mods! Also, problems can arise when using mods that have not been optimized for performance. Spark comes in and allows you to run profiling tests to see exactly what processing jobs on your server are causing lag.

The only problem that I have with this mod is that I have trouble reading the data that the profiler gathers, even while using the Spark guide!

0
0
Posted August 22, 2026 at 10:15:53 PM UTC
spark
5.0

Comprehensive Server TPS Info!

Puppydaze

Reputation ranks

Explorer 0 pts
Contributor 100 pts ←
Guide 500 pts
Veteran 1,500 pts
Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks
Total 1,000 hrs MC 1.21, 1.2… MC 1.21, 1.20
The version(s) the reviewer played
Performance
5.0

For anyone who plays extensively stressful Minecraft modpacks, this is a requirement! It's very common for servers (and single-player worlds) to start lagging under heavy loads when featuring heavy usage of tech mods! Also, problems can arise when using mods that have not been optimized for performance. Spark comes in and allows you to run profiling tests to see exactly what processing jobs on your server are causing lag.

The only problem that I have with this mod is that I have trouble reading the data that the profiler gathers, even while using the Spark guide!

0
0
Posted August 22, 2026 at 10:15:53 PM UTC
5.0
Puppydaze

Reputation ranks

Explorer 0 pts
Contributor 100 pts ←
Guide 500 pts
Veteran 1,500 pts
Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks
Posted August 22, 2026 at 10:15:53 PM UTC
Total 1,000 hrs MC 1.21, 1.2… MC 1.21, 1.20
The version(s) the reviewer played
0
0
5.0

A very useful profiling tool

Auseawesome

Reputation ranks

Explorer 0 pts
Contributor 100 pts
Guide 500 pts
Veteran 1,500 pts ←
Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks
Total 1,000 hrs MC 26.1, 26.… MC 26.1, 26.2, 1.21, 1.20, 1.19, 1.18, 1.17, 1.16, 1.12, 1.15
The version(s) the reviewer played
Performance
5.0

Spark is a mod that any server owner, pack maker and performance-centric end user should have. It allows you to easily see current resource usage as well as profiling over a period of time to see what mods are using up the most CPU time.

When making modpacks, this mod can be really helpful for understanding where the performance bottleneck is in packs. It is also really useful if you need to report bugs to mod authors, such as memory leaks, as you can dump the memory or get a brief summary.

As a server owner, this mod proved invaluable for discovering which areas of the world and whose bases were causing server lag, as it has a lag overlay which allows you to easily find problem areas. For the end user it is less useful, but it can help when making large bases to understand why things are slowing down and build things in a more efficient way.

Overall, this is just an incredibly useful tool for server owners and pack makers alike and I highly recommend it.

0
0
Posted June 19, 2026 at 6:32:21 AM UTC
spark
5.0

A very useful profiling tool

Auseawesome

Reputation ranks

Explorer 0 pts
Contributor 100 pts
Guide 500 pts
Veteran 1,500 pts ←
Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks
Total 1,000 hrs MC 26.1, 26.… MC 26.1, 26.2, 1.21, 1.20, 1.19, 1.18, 1.17, 1.16, 1.12, 1.15
The version(s) the reviewer played
Performance
5.0

Spark is a mod that any server owner, pack maker and performance-centric end user should have. It allows you to easily see current resource usage as well as profiling over a period of time to see what mods are using up the most CPU time.

When making modpacks, this mod can be really helpful for understanding where the performance bottleneck is in packs. It is also really useful if you need to report bugs to mod authors, such as memory leaks, as you can dump the memory or get a brief summary.

As a server owner, this mod proved invaluable for discovering which areas of the world and whose bases were causing server lag, as it has a lag overlay which allows you to easily find problem areas. For the end user it is less useful, but it can help when making large bases to understand why things are slowing down and build things in a more efficient way.

Overall, this is just an incredibly useful tool for server owners and pack makers alike and I highly recommend it.

0
0
Posted June 19, 2026 at 6:32:21 AM UTC
5.0
Auseawesome

Reputation ranks

Explorer 0 pts
Contributor 100 pts
Guide 500 pts
Veteran 1,500 pts ←
Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks
Posted June 19, 2026 at 6:32:21 AM UTC
Total 1,000 hrs MC 26.1, 26.… MC 26.1, 26.2, 1.21, 1.20, 1.19, 1.18, 1.17, 1.16, 1.12, 1.15
The version(s) the reviewer played
0
0

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Available Platforms

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Compatibility

Supported Environments

Where It Runs
Either Side

Install on the client or the server — either alone gives full functionality.

About

Project Details

Type
Mod
License
GNU General Public License v3.0 only
Latest Version
1.10.173 (NeoForge 26.2)

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About

Description

spark

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

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

Useful Links

BisectHosting

spark is proudly sponsored by BisectHosting.​


BisectHosting are Minecraft server hosting experts, ready to help you create and host your very own server! They are a trusted and well-established hosting provider in the community, and provide an outstanding level of service that we are happy to recommend. There is a special 25% off discount available for spark users - click the link above to create your server today.

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.

Usage

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.

Guides

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

spark

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

Useful Links

spark is proudly sponsored by BisectHosting.​

BisectHosting are Minecraft server hosting experts, ready to help you create and host your very own server! They are a trusted and well-established hosting provider in the community, and provide an outstanding level of service that we are happy to recommend. There is a special 25% off discount available for spark users - click the link above to create your server today.

What does spark do?

spark is made up of three separate components:

  • CPU Profiler: Diagnose performance issues.
  • Memory Inspection: Diagnose memory issues.
  • Server Health Reporting: Keep track of overall server health.

⚡ 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.
  • 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 systems 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.

There are two different profiler engines:

  • Native AsyncGetCallTrace + perf_events - uses async-profiler (only available on Linux x86_64 systems)
  • Built-in Java ThreadMXBean - an improved version of the popular WarmRoast profiler by sk89q.

⚡ 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.

Usage

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.

Guides

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

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