When you are in the ocean at a height where entities can not do spawn, they start loading and unloading entities very fast. It causes a pretty serious amount of lag. Reducing the amount of rendering distance can fix the problem for a while.
Replicate: position yourself in the ocean and climb to a considerable height, up to y = 200 for example. See the amount of entities that are generated, the ram consumption, console messages, etc.
VIDEO: https://youtu.be/uHc1Pd1Yla8
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However, this issue is a Duplicate of MC-91621.
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