0.4.0-alpha.0.121 backport devbuild for 1.21.1 is an alpha file of the Minecraft mod C2ME OpenCL Acceleration Module for NeoForge, made for Minecraft 1.21.1. It was published on September 16, 2026 and is 2.9 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the C2ME OpenCL Acceleration Module mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
