String Clumps
by ubiqqe
String Clumps groups nearby string entities into a single stack, so a dense cluster of strings costs the game less to process.
What it does
Item stacks of string that sit close together are merged into one entity. The mod targets the lag caused by string duper setups, where large numbers of loose string entities pile up in one place. Gathering them into fewer entities reduces the work the game must do each tick, and the gain is mostly noticed on servers.
Fabric API is required. The mod works on either side, and neither needs it, so it can run on a client alone, a server alone or both. It is published for 1.21.11 only, with 1.0.0 as the latest Fabric file, and is released under the Creative Commons Attribution 4.0 license, which means it is not open source.
Key features
Merges nearby stacks
Multiple string stacks close together are brought together into one entity, lowering the number of entities to process.
Targets string dupers
Clusters created by string duper setups are the main case the mod is aimed at, and they are the cause of most of the lag it reduces.
Works on both sides
The clumping runs on a client or a server separately, so either side can apply it without the other.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
How it compares
String Optimizer is a Fabric mod for 1.21 – 1.21.11 that is client-side only and under All rights reserved, so it is not open source. Good Clumps is an open source MIT-licensed mod that works on either side, and neither needs it, with Fabric and Babric files for b1.7.3.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| String Clumps | Fabric | 1.21.11 | Client or server, optional | 2026-02-20 |
| String Optimizer | Fabric | 1.21 – 1.21.11 | Client-side only | 2026-02-21 |
| Good Clumps | Fabric and Babric | b1.7.3 | Client or server, optional | 2026-06-13 |
Questions
Does String Clumps need Fabric API?
In the catalog
String Clumps is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from ubiqqe
Similar mods
What the author says
Clumps multiple stacks of string together to reduce lag. Can bring together multiple stacks of string entities nearby into one to improve performance (mostly on servers with string dupers).
Official listing
- Modrinth page
- modrinth.com/mod/string-clumps
- Owner
- ubiqqe
- Published
- 2026-02-20
- Updated on Modrinth
- 2026-02-20
- Facts verified
- 2026-10-15