LessLag
Server performance guardian for Paper/Spigot (1.20.4+) with Folia support
Server performance guardian for Paper/Spigot (1.20.4+) with Folia support
LessLag is a performance intelligence plugin focused on stability first: detect lag early, explain what is causing it, and apply safe mitigation before TPS collapses.
Why LessLag?
- Actionable diagnostics instead of blind cleanup
- Adaptive mitigation that reacts to real server pressure
- Modular controls for entities, redstone, AI, chunks, memory, and farms
- Low-overhead design with workload budgeting and on-demand deep stats
Core Features
- Performance Dashboard via /lg status: health score, MSPT percentiles (P50/P95/P99), uptime, queue and spike counters
- Tick Diagnostics via /lg tickmonitor: distribution, avg/min/max, spike visibility
- Lag Source Analyzer via /lg sources and /lg trace: identify hotspots and likely culprits
- Entity Protection + Smart Cleanup: protect named/tamed/NPC entities while targeting low-value overload sources
- Redstone Safeguards: activation limits, clock detection, piston pressure controls
- Mob AI Optimization: frustum/distance-based AI throttling to reduce CPU load
- Farm Optimizations: villager optimizer, breeding limiter, density optimizer
- Predictive Optimization: MSPT trend detection for proactive responses
Useful Admin Commands
- /lg status - Live performance dashboard
- /lg health - Health report with recommendation context
- /lg tickmonitor - Tick and MSPT distribution diagnostics
- /lg sources - Run lag source analysis
- /lg trace - Runtime bottleneck summary
- /lg density - Density optimizer limits + suppression stats
- /lg breeding - Breeding limiter blocked-event stats
- /lg reload - Reload configuration without restart
What Makes LessLag Different?
- No blind wipes: prioritizes diagnosis and targeted mitigation first
- Percentile visibility: uses MSPT distribution (P50/P95/P99) for realistic performance trends
- Proactive control: predictive optimization can trigger before TPS collapse
- Farm-aware optimization: villager, breeding, and density systems for real SMP/Skyblock pain points
- Operator-first workflow: command surface designed for daily checks and incident response
Recommended First 10 Minutes
- Run /lg status and /lg health to baseline current load
- Run /lg tickmonitor and /lg trace during peak activity
- If farms are heavy, inspect /lg density, /lg breeding, /lg villager
- Tune one config section at a time, then /lg reload
- Re-check percentiles and spike trend before changing more
Best-Fit Server Types
- Survival SMP with persistent player bases
- Farm-heavy economies / Skyblock
- Networks needing stable TPS with low admin noise
Compatibility
- Paper/Spigot 1.20.4+
- Folia supported
- Designed to coexist with common optimization stacks via compatibility toggles
Permissions
- lesslag.admin - Full command access
- lesslag.notify - Receive performance alerts
- lesslag.setup - Setup Advisor access
Install
- Drop LessLag.jar into /plugins
- Restart server
- Tune plugins/LessLag/config.yml to your needs
- Use /lg status and /lg setup for baseline verification
Performance Philosophy
- Telemetry counters piggyback existing event/tick paths
- Deep calculations (like percentiles) are command-time, on-demand
- Heavy analysis is workload-budgeted to reduce tick impact
Website
https://lesslag-web.vercel.app
Support / Feedback
Open an issue with your timings/profile context and LessLag command output for faster diagnosis.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.20.6, 1.21
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Spigot — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Lesslag | A PLUGIN HELP YOU SETUP YOUR SERVER | NOW WITH FOLIA SUPPORT is a free Minecraft Java mod. Compatible with Minecraft 1.20.6, 1.21. Downloaded 113 times (via Spigot). Download it and open it directly in the game.