Smoothgl
Honest micro-stutter fixes for 1.21.4 Fabric: frame pacer, raycast occlusion, entity/particle/name-tag/beacon culling, GC watcher, JIT warmup, network input-lag tuner, adaptive auto-tuner, real-time stutter profiler with telemetry HUD. Честные фиксы микро
About this Mod
0.1.0 (Initial Release)
Features
- Frame profiler with stutter detection and breakdown HUD (F7)
- Adaptive distance culling for entities, block entities, particles, and armor layers
- Occlusion culling via raycast with TTL cache for entities and particles
- GPU frame pacer with configurable frames-in-flight depth
- JIT warmup on startup to reduce early-game micro-stutters
- Direct-buffer pre-touch on startup (configurable size)
- GC watcher to monitor pause times
- Network tuner (TCP_NODELAY, larger buffers, IP_TOS_LOWDELAY)
- Packet pump for reduced input lag on high-FPS clients
- Ping monitor with HUD display
- In-world debug renderer (F9 toggle) for cull boundary and occlusion rays
- Custom telemetry graphs (frame-time bars + ping line) in HUD
- Startup phase timer with
/smoothgl startupcommand
Commands
/smoothgl- status overview/smoothgl breakdown- frame breakdown/smoothgl startup- startup timing report/smoothgl dump- stutter dump/smoothgl reset- reset profiler/smoothgl set <key> <value>- runtime config
Keybinds
- F7 - Toggle frame breakdown HUD
Configuration
- All settings in
config/smoothgl.properties - Runtime-configurable via commands
Available Versions
How to Install Smoothgl 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 "Smoothgl". 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 (+5 more)
Server-side
✗ UnsupportedRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Smoothgl 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 Smoothgl compatible with fabric?
Smoothgl 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 Smoothgl – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Smoothgl 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 Smoothgl with just one click on your server.