Rubidium

Rubidium reduces the work the game does when drawing terrain. Vertex data for rendered chunks is packed more compactly, which lowers video memory and bandwidth needs by close to 40 percent. Chunk loading and block rendering receive a set of optimizations, so chunks load faster and frame rates dip less while they do.

Vertex building and matrix transformations are optimized as well, which speeds up the drawing of block entities, mobs and items in rooms that hold many of them. Memory handling and object allocation are also reworked, cutting memory use and the lag spikes that garbage collection can cause. Fluids and certain special blocks gain lighting that looks smoother, and biome transitions on blocks and fluids blend more gently, while animated textures that are out of view are skipped, which helps texture updates on most hardware.

Rubidium is built for Forge and NeoForge in game versions 1.16.5 – 1.20.1, with the latest files for 1.20.1 released on 2023-09-24. It runs on the client only, so servers do not need it. The code is under the GNU Lesser General Public License v3.0 only and is open source. Six other catalog mods require it, including Oculus and TexTrue's Rubidium Options.