Java Edition 1.5.1

1.5.1 is an update which mainly fixed issues with low frame rates on certain devices. As the protocol is the same as 1.5, players on 1.5.1 can connect to servers that are running 1.5. While it was not the last update to 1.5, it was the last one before the snapshots of 1.6.1 started.

Blocks

 * Hopper
 * Now take empty buckets out of furnace fuel slots

Items

 * Enchanted book
 * Can now be combined to raise their enchantment level or combine multiple enchantments on a single book
 * When combining two enchantments for a higher level variation, the player requires two of the same level enchanted book
 * They are still subject to the normal enchantment level limits.

General

 * Performance
 * FPS increase, bringing levels back to what they were in 1.4


 * Minecraft Realms
 * Improvements and changes

Release fixes
These fixes occurred between the last snapshot for 1.5.1, 13w12~, and the full release of 1.5.1.

Reupload
The 1.5.1 pre-release was reuploaded on March 20, 2013, to fix a null pointer crash. This reupload then proceeded to be the true release of 1.5.1.