When a server with 6gb ram 10 chunk render distance, and 3 players online all in the same area goes under because it ran out of memory, and I go into single player and flies around quickly with Elytra with 44 chunk render distance, and I don't even reach 3gb ram usage...
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@MojangSupport I think something is wrong causing servers to use too much memory.
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Replying to @Dran_____
I'm sorry to hear that. Perhaps you can report the bug again if you're still having the same issue? ^RR

Jul 16, 2019 · 7:02 AM UTC

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Replying to @MojangSupport
The server belongs to a friend, and we changed to Spigot Server from the official server jars, and it is a lot better. No lag and server running out of memory when I am traveling. With the official servers I could only travel a few hundred blocks with Elytra before it crashed.