Where Winds Meet is limited by the single core performance under Linux.

Specs
14900kf
RTX 5070ti
32 GB RAM
OpenSuse Tumbleweed, kernel 7.1.4, X11, Nvidia driver 595.84

Steam client, Proton experimental. 2k resolution.
Game and steam on Samsung 990pro nvme, system on another gen5 nvme (Apacer)

CPU and GPU are fine. No thermal or power throttling. No problem in the other games, apps, tests.

Main issue:
There are very few locations in the game where the GPU load reaches 90%+ and I get a stable fps of 120+ (DLAA or native) . In most cases, GPU load is 40-60% and frame rate is 60-85. Graphics settings have no effect on the situation. Zero or very low IO outside of loading screens. It's unlikely that the problem is with the disk. Some time ago I switched from 13600kf to 14900kf and got the expected increase of about 25%.

My guess is that the problem is still OS-dependent. While the 14900kf isn't a top CPU, it's still decent. If the game had such problems with the CPU on Windows, then there would have been an expected wave of indignation from owners of mid-range systems. Unfortunately, I don't have Windows or a fourth NVMe slot to install it and test this directly.

Question:
Perhaps someone has encountered a similar problem in this or another game and it can be solved by specifying specific Proton directives?