When joining a local Superflat World with 1 Layer of Bedrock and several Layers of Sandstone, the game begins to lag and after a while stops responding completely.
The Log (from the Launcher) is attached.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MC-12949.
Your Minecraft is out of memory. See this article on how to allocate more RAM.
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