Perf Boost
Perf Boost is a Fabric mod for Minecraft 1.21.10 that adds a toggleable performance HUD (FPS, RAM, CPU, ping, etc.) and an optional performance mode.
⬇ Download on Modrinth
What this mod does
Perf Boost adds a stats HUD in the top-right (toggle with P) showing FPS, frame time, RAM usage, entity and chunk counts, ping in multiplayer, and CPU usage/temperature when available. It also adds performance mode (toggle with O): when enabled, the mod temporarily lowers your graphics settings to improve FPS, and restores them when you turn it off.
What performance mode changes
When you turn performance mode on, the mod temporarily applies:
- Graphics → Fast | Particles → Minimal (and caps active particles at 2,000) | Render distance → 8 chunks | Simulation distance → 6 chunks | Entity distance scaling → 0.5 | Ambient occlusion → off | Entity shadows → off | Biome blend → 0
When you turn it off, your previous settings are restored. Nothing is written to your options file; it only affects the current session.
Why use it
- See FPS and system stats at a glance without leaving the game.
- Get a quick FPS boost in busy areas (e.g. lots of entities or particles) by pressing O; turn it off when you leave.
- Keybinds (P and O by default) are rebindable under Perf Boost in Options → Controls.
Performance HUD (press P to toggle)
Keybinds in Settings
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.10
- 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 Modrinth — 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.
- Ships as perfboost-1.0.0.jar — drop this file into the mods folder
- Download size: 936 KB
- Download link checked 27 Aug 2026 — working
These come from our own check of the pack file, not from the source page.