Bad surface finish

[MihaiDesigns]

Left: 1K acceleration without IS.
Center: 1K acceleration with IS.
Right: 3K acceleration with IS.
Printing at 150mm/s speed on a CoreXY about the size of a 400mm cube build volume.

Is this normal?
Coextrusion filament. Looks a bit like silk, very shiny, so artifacts are emphasized.
IS, PA, and jerk are already calibrated (at least to some extent).
Running RRF 3.5.0-rc.1. (I haven't tried any other version).

It looks better if I print much slower, but still, the prints look very bad to me. I'm hoping there's a way to improve the surface considerably.