A lightweight client-side FPS optimization mod for Minecraft 1.21.11 (Fabric). When large amounts of the same item are dropped on the ground in a pile — like after a mob farm, bulk crafting, or a death — Minecraft renders every single item entity individually, which can tank your FPS. StackCluster fixes this by detecting clusters of the same item and hiding a configurable percentage of them visually. The items still exist and can be picked up normally — they're just not rendered. Features:
Fully client-side — works on any server, no server-side install needed Configurable cluster radius (how far to search for same-type items) Configurable minimum cluster size (how many items trigger culling) Configurable cull percentage (how many items in a cluster to hide) Master on/off toggle In-game config screen via ModMenu + Cloth Config
Requirements:
Fabric Loader 0.19+
Fabric API
Cloth Config
ModMenu (optional, for in-game config screen)
Performance tip: The default settings (3 block radius, min 3 items, 90% culled) are conservative. For mob farms or bulk item drops, try radius 5-6 and 95% cull for maximum FPS gains.
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.11
- 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 stackcluster-optimizer-1.0.0.jar — drop this file into the mods folder
- Download size: 979 KB
- Download link checked 7 Sept 2026 — working
These come from our own check of the pack file, not from the source page.