Profile performance on Minecraft clients, servers, and proxies with the spark profiler.

spark.lucko.me
spark homepage screenshot

About spark

spark is a performance profiler for Minecraft clients, servers, and proxies. It has three main parts: a built-in profiler for finding bottlenecks, memory inspection that can produce full heap dumps and monitor garbage collection, and health reporting for key metrics over time. The website also works as an online viewer, where you can open .sparkprofile or .sparkheap files created with spark commands.

Pricing is not clearly stated.

Key features

  • Built-in profiler for finding performance bottlenecks
  • Memory inspection with full heap dumps and memory summaries
  • Garbage collection (GC) activity monitoring
  • Health reporting of key metrics over time
  • Online viewer for .sparkprofile and .sparkheap files
Watch out for
  • Viewer accepts only .sparkprofile and .sparkheap files
  • Viewer data must be generated with spark commands first

spark at a glance

Type
App
Pricing
Not confirmed. Check the site
Platforms
Web
Details verified
Oct 21, 2026 · Official source
Open source
Not stated
Language
English
Last checked
Oct 5, 2026 · Online when checked
Listed
Oct 5, 2026

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