Java Edition pre-Classic rd-131641
From Minecraft Wiki
May 13, 2009
rd-131641 refers to a pre-Classic version of Minecraft: Java Edition (or, as it was known back then, Cave Game) made on May 13, 2009. This version was unreleased, and no footage exists of this build.
- Improved performance slightly.
- "lwjgl IRC logs" (archived) – Echelog, May 13, 2009. "[18:41:59] <Notch_> I made it only update two chunks per frame maximum, and it's very slow"