Free tool
Spark Analyzer
Paste a Spark profiler URL and get an instant performance diagnosis. Free, no signup required.
What we analyze
- TPS and MSPT (average, min, max, p95 spikes)
- GC behavior (pause duration, frequency, collector type)
- Memory pressure (heap usage, host memory)
- JVM configuration (Java version, Xms/Xmx, Aikar's flags)
- Server config (view distance, simulation distance)
- World stats (entity concentration, loaded chunks)
- Plugin/mod detection (13+ known performance issues)
- Call-tree hotpath analysis (what config-only checkers can't do)
How it works
- 1. Run
/spark profileron your server - 2. Copy the spark.lucko.me URL
- 3. Paste it into our analyzer
- 4. Get findings sorted by severity with actionable fixes
vs config checkers: Rule-based tools read only metadata and config files. We analyze the actual call tree and timing data to find exactly which mod, plugin, or game mechanic is eating your TPS.
Frequently asked questions
Is this really free? No login?
Yes. No account, no token limit, no paywall. Paste a URL, get results.
What makes this different from the spark.lucko.me viewer?
The spark.lucko.me viewer shows raw data (flame graph, flat view). Our Spark analyzer automatically identifies the problem and tells you what to do about it.
Does it work with modded servers?
Yes. Paper, Fabric, Forge, NeoForge, Purpur, and Vanilla. We detect 13+ mods with known performance issues and analyze the call tree regardless of server type.
Can I share the results?
Yes. Every analysis has a permanent shareable URL. Send it to your co-admins or post it on Discord.