Performance Overlay
Lightweight performance overlay and benchmark tool. Real-time FPS & frametime metrics: average FPS, 1% / 0.1% lows, stutters, worst spikes, plus GC and memory stats.
Screenshots
About this Mod
FPS, Frametime & Benchmarking
Performance Overlay is a lightweight, client-side mod that shows what actually matters for smooth gameplay — not just average FPS.
It focuses on 1% / 0.1% lows, frametime stability, stutters, and frame spikes, helping you understand why Minecraft feels smooth or laggy.
📊 Performance Metrics
The overlay updates in real time and displays:
- FPS (average)
- 1% low FPS
- 0.1% low FPS
- Frametime
- Stutter count
- Worst frame spike
- GC pauses
- Memory usage
All metrics are designed for real performance analysis, not vanity numbers.
⌨️ Key Bindings
All features are accessible instantly via key binds:
- F7 — Toggle performance overlay
- F8 — Cycle overlay layout
- F9 — Reset performance statistics
- F10 — Start / stop benchmark
Key bindings can be changed in Minecraft → Controls.
🧩 Customisation
- Multiple overlay layouts
- Different screen positions
- Minimal and non-intrusive design
- Instant toggling without menus
🧪 Benchmark Mode
Run objective benchmarks and get detailed CSV results, including:
- Per-frame FPS and frametime data
- Average FPS, 1% / 0.1% lows
- Worst stutters and frame spikes
- Run metadata for comparison
📁 Files are saved to:
.minecraft/config/performanceoverlay/benchmarks/
CSV files can be opened in Excel, Google Sheets, or any analysis tool as well as AI chats.
🎯 Use Cases
- Diagnosing stutters and micro-freezes
- Comparing shaders, mods, modpacks, or settings
- Measuring real smoothness instead of “feels smoother”
- Benchmarking performance changes reliably
ℹ️ Notes
- Client-side only
- Lightweight and low overhead
- No gameplay or logic changes
🔁 Redistribution
You are free to:
- Use this mod in modpacks (public or private)
- Include it in custom client setups
- Fork or modify the code for your own needs
If you re-upload this mod (modified or unmodified), please:
- Credit Performance Overlay as the original project
- Link back to this Modrinth page
- Use a different name and icon for modified versions
License
MIT License
Available Versions
How to Install Performance Overlay on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "Performance Overlay". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11, 1.21.10, 1.21.9 (+9 more)
Server-side
✗ UnsupportedRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Performance Overlay server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.
Is Performance Overlay compatible with fabric?
Performance Overlay officially supports fabric for Minecraft 1.21.11, 1.21.10, 1.21.9. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Performance Overlay – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Performance Overlay consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
Rent Modded Server
Install Performance Overlay with just one click on your server.