Afterburner: Optimized

The mod changes how chunks are drawn. Instead of one draw call per chunk, a region of 128 by 64 by 128 blocks is sent in a single call. Chunk vertices are also stored in 16 bytes rather than 28, which means the graphics card reads less data and chunks take less graphics memory.

Several culling passes skip work that would not be visible. Chunks hidden behind nearer terrain, hills, caves or walls are not drawn, and entities such as mobs, chests and signs that sit behind terrain are left out. Block faces pointing away from the camera are skipped, and translucent faces such as water, glass and ice get their own culling. Per-frame preparation also skips chunk layers that have nothing to draw, and chunks around the player are built off-screen so holes are less visible when the view turns.

The mod works with both OpenGL and Vulkan. It requires Fabric API. Files are published for Fabric and Forge, with the latest Fabric build 0.1.28 for 1.21.1 and the latest Forge build 0.1.27 for 26.3, both released 2026-10-12. The project is open source under the MIT License, and its source code is public.