Hi, first, sorry for my bad english.
I have two worlds in minecraft 1.9.2 vanilla, after a few minutes the launcher console begins to show too many messages like "Keeping entity that already exists with UUID" and the world begins a little laggy.
i try to teleport to the entity with the command "/tp @e <UUID>" and when the game teleports me, too many of the entities of the world teleports to that place and the game is very laggy in this point
after that i kill those entities with the command "/kill <UUID>" all of those entitites die.
this solve the problems for a few minutes, after that, the same message appears in the console and the same happens.
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I found this while looking for solutions for the spam. I know it's old by now, but: When reading the description, I noticed you mention "/tp @e <UUID>" – this will teleport ALL ENTITIES to that uuid, not just you! @p is the one that references the player.