Java Edition Beta 1.6.3

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Minecraft Beta 1.6.3
Beta 1.6.3.png
Beta 1.6.3 in-game.png

Java Edition

Release date

May 26, 2011


Client (.json)
Server (.exe)

Protocol version


Other instances
of 1.6.3

Beta 1.6.3 is a version of Java Edition Beta released on May 26, 2011,[1][2] which fixes some of the bugs and crashes in Beta 1.6.2.



  • Water that is 2 blocks deep no longer prevents fall damage.
    • Players need at least 3-block-deep water to prevent fall damage.


  • The renderer is now capped at 100 fps while there are chunks to be generated. The excess time will be spent generating chunks instead of rendering frames.
  • The "limit framerate" option now limits the game to 40 fps and will spend at least 10 ms per frame sleeping.
  • The "limit framerate" option has been reset to "off" for all players, enable it again if wanted.


3 bugs fixed

  • Fixed some block updates not updating lighting properly under some circumstances by reverting the fix in 1.6 that lead to block data not always being sent.
  • Fixed a major CPU load issue in the server where a very tight loop would starve all other threads.
  • Fixed furnaces dropping/duplicating their contents when they change state from lit to unlit or back.