LagProfiler
by xEnif
LagProfiler is a Fabric HUD overlay that shows the client's frame rate, tick time, entity count, chunk loading and memory use in one compact panel.
What it does
A players who notice stutter but cannot tell its source can open the overlay in place of the cluttered F3 debug screen. It tracks the figures that affect frame drops on the client, and a status line changes to a red LAG DETECTED warning when local tick or frame time spikes above 50ms, then returns to a green STABLE status when the spikes stop.
The mod runs on the client alone and is published for Fabric only, across eight release versions. The latest file is 1.0.0 for 1.21.11, released on 2026-06-05. It is released under the MIT License, but it is not open source.
Key features
Stutter status indicator
The status line switches to red with the words LAG DETECTED when a tick or frame spike passes 50 milliseconds, and shows green STABLE otherwise.
Live frame rate and tick time
Frames per second are shown with drops marking rendering trouble, next to the exact length of each client processing cycle in milliseconds.
Entity and chunk counters
The overlay counts rendered entities nearby, which helps spot mob farms or dropped items, and the rate at which new map chunks load.
Memory readout
Current memory in megabytes is displayed, which helps identify leaks and stutter caused by Java garbage collection.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Finding the cause of a stutter
A player who sees frequent drops can read the tick time, entity count and chunk rate together to narrow the source of the lag.
Watching high render distances
Flying fast or running high render distances can cause chunk loading spikes, which the chunk rate line makes visible.
Who it’s for: The mod suits players on Fabric who want to diagnose client-side performance during play without reading the full F3 screen.
How it compares
Armor HUD is a Fabric client mod for 1.21.11 that is not open source and is covered by All rights reserved, so its use is limited by that license. Item Glow (Java) is a client-side Fabric mod for 1.21.1 released under the MIT License and open source. KozaCore is a client-side Fabric mod for 1.21 under the MIT License that is not open source. LagProfiler covers performance rather than armor or item display.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| LagProfiler | Fabric | 1.21.4 – 1.21.11 | Client-side only | 2026-06-05 |
| Armor HUD | Fabric | 1.21.11 | Client-side only | 2026-04-29 |
| Item Glow (Java) | Fabric | 1.21.1 | Client-side only | 2026-05-03 |
| KozaCore | Fabric | 1.21 | Client-side only | 2026-05-22 |
Questions
Does LagProfiler need Fabric API?
Does the server need LagProfiler installed?
Which game versions does LagProfiler support?
In the catalog
LagProfiler is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from xEnif
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What the author says
This mod introduces a sleek, lightweight HUD overlay designed specifically to help players monitor their local game performance and diagnose client-side lag or stuttering in real-time. Instead of relying on the cluttered F3 debug screen, this mod provides a clean UI that tracks exactly what is impacting your PC's…
Official listing
- Modrinth page
- modrinth.com/mod/lagprofiler
- Owner
- xEnif
- Published
- 2026-06-05
- Updated on Modrinth
- 2026-06-05
- Facts verified
- 2026-10-15