BandwidthOptimizer
by PInk_Cats
BandwidthOptimizer reduces the network traffic that heavily modded Minecraft servers send to their players, and it has to be installed on both sides.
What it does
Packets are shrunk once Minecraft or the loader has finished building them. The mod can map repeated packet structures, batch small packets, compress streams across frames and reuse chunk data a client already holds. Idle clients can also have presentation-only traffic reduced, with current state restored when the player returns.
Results differ from one server to another and depend on which packets are sent. Measured figures from real heavily modded servers are historical baselines, not guarantees. Data that is already compressed, encrypted or media-like gains little from a second compression layer.
Builds cover 1.19.2 – 26.2 for Fabric, Forge, NeoForge and Quilt. Fabric builds need the Fabric API library installed alongside. The code is under the GNU Lesser General Public License v2.1 or later, so the project is open source.
Key features
Cross-frame compression
Zstd compression runs across frames with sequence and epoch checks, and recovers from missing or invalid boundaries.
Packet mapping and batching
Repeated packet structures get literal and template mapping, and small packets are batched in order with protected flush points.
Verified chunk transport
Chunks are sent as full data, references or patches, and reused chunks are checked by hash before use.
Idle traffic reduction
Light and deep idle states cut presentation traffic, then restore block, entity and HUD state when play resumes.
BO Stats reports
The /bandwidthoptimizer stats command uploads a report with charts, player history and packet attribution.
Gallery
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
Not Enough Bandwidth Fabric is a client-and-server mod for Fabric only, covering 1.20.1 – 26.2 and open source under the GNU General Public License v3.0 only. Not Enough Bandwidth Legacy(NEBL) is also client and server and open source under the GNU General Public License v3.0 or later, with Forge and NeoForge files for 1.12.2 – 1.21.1. ModelEngine Client Optimization is client-side only, is not open source and uses a custom license for 1.19.4 – 26.2 on Fabric and NeoForge.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| BandwidthOptimizer | Fabric, Forge, NeoForge and Quilt | 1.19.2 – 26.2 | Client and server | 2026-10-12 |
| Not Enough Bandwidth Fabric | Fabric | 1.20.1 – 26.2 | Client and server | 2026-09-27 |
| Not Enough Bandwidth Legacy(NEBL) | Forge and NeoForge | 1.12.2 – 1.21.1 | Client and server | 2026-08-19 |
| ModelEngine Client Optimization | Fabric and NeoForge | 1.19.4 – 26.2 | Client-side only | 2026-06-22 |
Questions
Does BandwidthOptimizer need a library on Fabric?
Must the server and players both install it?
Which versions have files?
In the catalog
BandwidthOptimizer is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 13,894 mods support Minecraft 26.2.
More from PInk_Cats
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What the author says
BandwidthOptimizer is a client-and-server network optimization mod built for heavily modded Minecraft servers. It reduces repeated packet traffic from chunk travel, login synchronization, custom payloads, machines, storage systems, and idle clients while restoring the original encoded packet stream before normal…
Official listing
- Modrinth page
- modrinth.com/mod/bandwidthoptimizer
- Owner
- PInk_Cats
- Published
- 2026-04-12
- Updated on Modrinth
- 2026-10-12
- Facts verified
- 2026-10-15