Here we look at the 12w27a snapshot, which updated the following -

-Performance improvements, including reduced CPU, RAM & bandwidth requirements.
-Updated Pistons to make them less error-prone, thus they also appear to update slower. This also altered the way Pistons work, so you might have to adapt your repeater delays and similar.
-Signs are stackable up to 16.
-Crafting them now gives 3 signs instead of 1 with the same recipe.
-Creative mode inventory now shows potion effects.
-Boats now drop the boat item when destroyed.
-Gaining Experience from mining ore is now different for each type of ore. (Mining Coal will give you the least amount while Diamond Ore & Emerald Ore will give the most amount of XP).
-Fortune enchantments no longer affect Experience drop rates
-The Debug (F3) Pie chart now shows the game rendering performance (White)
-Nether Wart can now grow in the Overworld and The End

To see what bugs are in this snapshot, click here http://bit.ly/IK752f

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