Java Edition pre-Classic rd-131648

rd-131648 is the first unreleased version of Minecraft pre-Classic (then known as Cave Game) created on May 13, 2009. This version was never released to the public, and there isn't any footage either. Despite the fact that the development of Minecraft began some time before this version, older testimonies are not considered separate versions, as they were extremely unstable and, in fact, unplayable.

Fixes

 * Increased performance.