Maybe they can implement some of the calculations in GPU, as vulkan has feature to support that. This means voxel rendering could be accelerated

Does it actually use voxels? I thought it was just a low poly, "voxel like" art style.

The underlying world representation is chunky voxels, but they get triangulated into meshes for rendering. Unlike say, Teardown, which renders voxels directly.

Minecraft's non-world entities like players and enemies aren't voxels at any level though, those are directly authored as low poly meshes.

I use Unigine Heaven to benchmark Linux systems. A colleague's friend has an epic spreadsheet of Heaven benchmarks across many configurations, and he submitted a few I've done. I ran it at home on my Linux desktop. For shits and giggles, I also downloaded the Windows version and ran it in Proton, and got a 30% performance boost! I suspect that a lot of that is due to the dxvk library that Proton uses, and the multithreading that it introduces translating D3D11 calls to Vulkan.

https://benchmark.unigine.com/heaven

https://github.com/doitsujin/dxvk

There's a "newer" (almost ten years old) Unigine benchmark available called Superposition you should check out.

https://benchmark.unigine.com/superposition

I'm aware. I work in ewaste recycling, and most of the machines I come across are about 10 years old. I'm also a fan of JayzTwoCents. https://m.youtube.com/watch?v=ukb5tlT4IuQ

With a lot of games you can put DXVK DLLs in its folder and get better performance: https://github.com/doitsujin/dxvk/releases