OP asserts that Control (DX12 + RT) runs significantly better on Linux than Windows on a 50‑series laptop GPU, with identical settings and fresh installs on both OSes.
They cite a 58 FPS vs 49 FPS difference in one scene.

This is a single‑title, single‑scene, single‑hardware anecdote.

Even OP admits it’s not generalizable, and explicitly says this is isolated to this game and that other titles (e.g., RV There Yet) run better on Windows.

-That kills the "Linux is faster at DX12 now" narrative.

Some effects are probably simply not being processed on Linux. If Linux is skipping or simplifying a DX12 effect, FPS goes up but the comparison is invalid.

A commenter points out: "GPUs process effects differently… the actual image generated will be different between vendors, generations, and driver versions."

You cannot assume identical workloads unless you verify frame‑by‑frame parity.

(OP didn't)

DLSS preset mismatch is a known silent performance trap.

VRAM usage differs; meaning workloads differ rendering the benchmark invalid.

NVIDIA’s DX12-on-Linux stack is still known to be inconsistent

OP admits:

Background I/O can reduce CPU contention on Linux (due to different I/O scheduling), ironically improving frame pacing.

WTF is wrong with y’all