FPSFlow

Real FPS improvements — no placebo, no bloat.

FPSFlow is a client-side Fabric optimization mod that targets the biggest rendering bottlenecks in vanilla Minecraft. Every feature is measurably effective, individually toggleable, and automatically adjusts to your hardware via four built-in performance profiles.

✦ Features at a Glance

Feature What it does 🔍 Entity Culling Frustum, occlusion, and distance culling. Dual-point raycasting prevents false-positives on small entities. Auto-disables when EntityCulling is detected. 📐 Entity LOD Entities beyond a configurable distance render every 2nd tick. Server NPCs and entities within nameplate range are always fully exempt — no flicker, even in busy lobbies. 🏷️ Nameplate Culling Hides name tags beyond a configurable distance. Server-forced labels are never hidden. 🧱 Block Entity Culling Skips chests, furnaces, signs, banners, and item frames beyond the configured range. ✨ Particle Optimization Count cap + three-zone density LOD (full / ~50 % / none) based on distance from player. 🖼️ Painting Back-Face Culling Instantly skips paintings when the camera is behind them — they are never visible from the back. 🌙 Background FPS Limiter Caps frame rate when the window loses focus, is minimised, or on any loading/menu screen (reduces GPU spinning during startup). 🌍 Singleplayer Boost More aggressive adaptive culling in singleplayer — frees CPU for chunk generation threads so exploration stays smooth. ⚡ World Join Optimizer Culling distances ramp up from 35 % on join and return to 100 % over ~10 seconds — eliminates the initial FPS spike. 🎮 GUI & HUD Optimizer Dirty-flag hotbar caching (including CustomModelData); HUD throttling with immediate response to actual stat changes. Caches auto-clear on resource-pack reload to prevent stale item textures.

✦ Performance Profiles

One setting, four presets — changing the profile rewrites all other settings automatically.

Profile Entity Dist. BE Dist. LOD threshold Nameplate Particle (mid/max) BG FPS (unfoc/min/menu) Quality 128 b Off 128 b Off Off 30/10/120 Balanced (default) 64 b 64 b 96 b 32 b 32/64 b 60/30/120 Performance 48 b 48 b 64 b 24 b 16/32 b 10/3/120 Ultra Performance 32 b 32 b 40 b 16 b 8/16 b 5/2/60

Set "profile": null in the config to use fully custom values.

✦ Compatibility

FPSFlow detects installed mods at startup and automatically disables overlapping features.

Mod Status 🟢 Sodium Fully compatible — FPSFlow adds entity/GUI optimizations on top 🟢 Lithium No overlap — both run independently 🟢 FerriteCore No overlap — both run independently 🟢 ModernFix No overlap — both run independently 🟢 ModMenu Optional — enables in-game config screen ⚡ EntityCulling (tr7zw) FPSFlow's built-in culling disables automatically — recommended companion for superior occlusion accuracy ⚡ ImmediatelyFast FPSFlow's HUD caching defers automatically

Recommended stack: Sodium + Lithium + FerriteCore + ImmediatelyFast + EntityCulling + ModMenu + FPSFlow

✦ Installation

1. Install Fabric Loader for Minecraft 1.21.11
2. Download and install Fabric API
3. Drop the FPSFlow .jar into your mods/ folder
4. (Optional) Install ModMenu for the in-game settings screen
5. Launch — the config is written automatically on first run

✦ FAQ

Does FPSFlow conflict with Sodium, Lithium, or FerriteCore? No. FPSFlow is designed to complement these mods — install all of them together.

Can entities "pop in" with occlusion culling? Rarely. The cache refreshes every 10 ticks (configurable). FPSFlow samples the entity's eye position for the raycast — naturally above the geometric centre, which avoids false-positives for small entities like floating heads and armor stands.

Does this work on servers? FPSFlow is purely client-side — works with any server, no server installation required. Servers that send a custom resource pack are fully supported: FPSFlow detects the pack reload and pauses render throttles for ~3 seconds so item-frame maps and hotbar items always show the correct textures after the pack loads.

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✦ Source & License

GitHub — McAffe13/FPSFlow · Licensed under the Mozilla Public License 2.0