Ceres

Ceres compresses only packets above a configurable size threshold, so small packets are not burdened with compression overhead. It balances compression ratio against processing cost, and when raw data would come out larger than the original, it falls back to sending the data uncompressed. A smart detection step identifies redundant network packets and filters them, with type filtering and configurable filtering positions for chunk and entity packets.

Two modes cover different needs. The first keeps Forge's own networking path, which favors compatibility with other mods, while the second works directly with Netty for deeper optimization, which can clash with some mods. Safety mechanisms include a timeout and a limit on consecutive duplicate packets, which keep game state synchronized. If problems appear, switching to the compatible mode or disabling specific optimizations is the suggested step.

Ceres must be installed on both the server and every client, and it is published for Forge only. Files exist for 1.19.2, 1.19.3, 1.19.4 and 1.20.1, with 0.2.3 for 1.19.4 as the latest file. The code is open source under the GNU General Public License v3.0 or later.