I don't know if anyone else has had this problem, but I get a frame rate of 0 when I try to place or break any blocks. It happens for only about a second, but I've never had this happen before this snapshot.
UPDATE: It no longer drops to zero, but it still drops (for me it goes from 14-15 fps to 8-9)
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Duplicate of MC-123584. Please go and upvote that ticket instead.