Set your tick speed to something like 30, and plant a bunch of trees. Memory usage (normally at ~30%) quickly grows from 30% to 75% (max 75%) and drops back to 30%, causing frame drops when it releases the memory.
I could attach the actual world to test, with the tick speed already set, but it's too large (25MB)
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@violine1101 I can reproduce this with a tick speed of 3, it's just not as fast (to clarify by not as fast I mean the memory usage cycle described below doesn't happen as fast).
In any case, it should not be following this pattern of holding memory until a certain point, and releasing it, no matter how much memory I am running it with.
Duplicate of MC-76117.
Don't change tick speed if your computer can't handle it.