If I turn Vsync off I can get 500 FPS but when I whenever I look around and loads new chunks the memory percentage goes all over the place and my FPS drops under 30 for around 1to 5 seconds. I have tried allocating more and less RAM and tried to do multiple fixes from other forums with the same problems but none of them help.
MC-168899
High FPS, but jittery lag spikes when loading new chunks.
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What are your graphics settings, such as render distance and biome blend?