a very big lag in creative, if you place/destruct only 1 block the lag makes double click and 2 blocks are placed/destructed. And it is only in snapshot 13w04a
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Duplicate of MC-1887, please use the search function to see if your bug has already been submitted. Currently over 50% of tickets are being closed as duplicate.
This is something with input. I had same problems at random since alpha. It stopped when I updated lwjgl. Not sure if it's related.