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FixLag

by Earth1283 • Downloads: 0 • Followers: 0
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🛠️ FixLag: Performance without Compromise

FixLag is a lightweight but powerful performance suite for Paper, Purpur, and Spigot servers. While most lag-fix plugins simply delete items on a timer, FixLag uses Smart Analysis to keep your server running at a smooth 20 TPS without breaking your players' hard-earned farms.

🚀 Why choose FixLag?

  • 🛠️ Actually Fixing Lag: The /fixlag optimizeconfig command scans your spigot.yml, bukkit.yml, and paper.yml to suggest better settings used by more experienced server admins. This prevents major sources of lag permanently.
  • ❌ No More Accidental Deletions: With the Retrieve GUI, players can recover items that were cleared during a cleanup. You can also whitelist custom-named items.
  • 🧠 Reactive Scaling: Features like Dynamic Distance and Explosion Optimization only kick in when the server actually struggles. If your TPS is fine, FixLag stays out of the way.
  • 📈 Staff Alerts: Get instant notifications if a player is creating an entity-lag machine or if RAM usage exceeds 90%.

✨ Feature Highlights

  • Mob Stacking: Merges mobs into stacks to save CPU cycles.
  • Chunk Analyzer: Instantly find which base or farm is causing the most entity lag.
  • Smart Clear: Only clears entities when TPS drops below your target (e.g., 16.0).
  • Detailed Stats: Beautifully formatted /serverinfo and /gcinfo commands.

📋 Quick Start

  1. Drop the JAR into your plugins folder.
  2. Restart your server.
  3. Configure your preferences in plugins/FixLag/config.yml.
  4. Use /serverinfo to check your current performance!

Permissions: FixLag uses standard permissions (e.g., fixlag.command, fixlag.serverinfo). All commands default to OP.

Support: Found a bug? Please report it on our GitHub Issues page!

All Versions

+ Add Version
Name Game version Platforms Published Downloads Actions
26.2 26.1.x 1.21.x +4
Bukkit Paper Purpur Spigot
7h ago 1
26.2 26.1.x 1.21.x +4
Bukkit Paper Purpur Spigot
7h ago 1
26.2 26.1.x 1.21.x +4
Bukkit Paper Purpur Spigot
7h ago 1
26.1.x 1.21.x 1.20.x +3
Bukkit Paper Purpur Spigot
7h ago 1
26.1.x 1.21.x 1.20.x +3
Bukkit Paper Purpur Spigot
7h ago 1
26.1.x 1.21.x 1.20.x +3
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +1
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +2
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +12
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +12
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x +12
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x 1.20.x 1.19.x
Bukkit Paper Spigot
7h ago 1
1.21.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x
Bukkit Paper Purpur Spigot
7h ago 1
1.21.x
Bukkit Paper Spigot
7h ago 1
patched the following bugs on the Mojang bug tracker:
MC-153831, MC-306840, MC-311414, and MC-263882.
Also note that the fix to MC-263882 is not a real 'fix'. To fix it will require either NMS patching (dangerous) or patching Paper/purpur (not my job here). The mitigation done for MC-263882 is simply to cap TNT speeds. This may or may not affect TNT cannon builds.
[3.15.3] FixLag 3.15.3 by Earth1283 on Oct 15, 2026
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Minor bug fixes--expect full compat.
[3.15.2] FixLag 3.15.2 by Earth1283 on Oct 15, 2026
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Patched some small bugs
[3.15.1] FixLag 3.15.1 HOTFIX by Earth1283 on Oct 15, 2026
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last version won't run.
[3.15.0] FixLag 3.15.0 by Earth1283 on Oct 15, 2026
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Added fixlag status and patched multiple race conditions & potential bugs
[3.12] New Redstone Checks by Earth1283 on Oct 15, 2026
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New redstone checks.
Along with a small code restructure.
1. added lag notifiers
2. improved code quality
[3.9.1] FixLag 3.9.1 by Earth1283 on Oct 15, 2026
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Major internal recode.
[3.9.0] FixLag 3.9.0 by Earth1283 on Oct 15, 2026
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  • fixed tab completion
  • added config file editing
  • rounded some corners in the ux
[3.7.1] FixLag 3.7.1 by Earth1283 on Oct 15, 2026
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Remove ground projectiles
Added Chunk Analysis & Actionbar Notifs
[3.6.3] FixLag 3.6.3 by Earth1283 on Oct 15, 2026
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added avg timeout
[3.6.2] FixLag 3.6.2 by Earth1283 on Oct 15, 2026
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added small qol features
[3.6.1] v3.6.1 by Earth1283 on Oct 15, 2026
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Added...
  • Mob stackers
  • Small optimizations
  • Auto config updates
[3.6] v3.6 by Earth1283 on Oct 15, 2026
Download
Added the following features:
1. A mob stacker (togglable)
2. Low-TPS based auto cleanup
3. Auto update configs
[3.4.1] FixLag 3.4.1 by Earth1283 on Oct 15, 2026
Download
fix messages
[3.3.1] V 3.3.1 by Earth1283 on Oct 15, 2026
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small version bump to keep the adventure api up to date
[3.3] ver 3.3 by Earth1283 on Oct 15, 2026
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added minimessage support
[3.2] FixLag 3.2 by Earth1283 on Oct 15, 2026
Download
Added async and efficient checking for overloads
Do not downlaod the beta release
This version isn't much differient, only that it had some minor tweaks over last time
[3.0.8] FixLag 3.0.8 by Earth1283 on Oct 15, 2026
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message patch
[3.0.6] FixLag 3.0.6 - OS Info by Earth1283 on Oct 15, 2026
Download
added OS info and arch info to /serverinfo
Added GC Types and Java version
Hopefully warnings and errors are adressed
Added some placeholders, such as %fixlag_count% whcih is how many entities exterminated by fixlag
Yes, I am aware that this program pumps out warnings and errors when fixing lag. Will patch this soon

For this update, I added:
1. Update checking
2. Better /serverinfo
3. Better /gcinfo

considering adding aliases to these commands
# Experimental Release!
## 🧪 Experiment contents:
🧪 - Update Checker (will add at 3.0.2)

🧪 - /serverinfo command for RAM, CPU, and other info & stats

## ⚡ Enhancements
⚡ - Async Threading

⚡ - Less redundant code

⚡ - Code efficiency Improvements (commingat 3.0.3 or later)
[3.0] FixLag 3.0 [GC INFO!] by Earth1283 on Oct 15, 2026
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  • Don't download the beta release!***

3.0 Official!
Added GC Info and more!
rewored the whole plugin
Completely refactored FixLag
Issues might occur
[2.6.2] Version 2.6.2 by Earth1283 on Oct 15, 2026
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Startup messages for logging
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