My FPS drops randomly, it goes from a smooth gameplay for a very strange laggy gameplay. I noticed that it is worse at high heights and above the ocean. When I move my screen from top to bottom or vice versa very fast it also happens.

What is strange is that my avarage CPU and GPU use is ALWAYS 60%, even when the bug is happening.

I've already tried to turn off vsync, which stopped this "dropping FPS", but my computer needs it turned on (Minecraft used to run very smoothly before 1.16.220 with Vsync on).

Finally, I'm almost sure that this issue is related to Vsync because of the things I wrote above.

Note: reducing some graphics, this bugs happens less times, but it still happens

Render Distance that I used to play with: 24 chunks (16 nowadays, trying to reduce the issue)

Computer Specs: AMD Ryzen 7 3700 U; GPU: AMD Radeon RX Vega 10; RAM: 8GB; SSD