Hmmm I think I see what's happening here. Basically, all devices I tested (laptops/phones/tablets) seem to have small pixel size, and to save on compute power for weaker devices I decided to render with half as many pixels as the screen has, letting the browser upscale the result. In your case, pixels are probably quite a bit larger, and half-res rendering has these prominent artifacts.
Can you try if increasing "render scale" in params->display helps?
Can you try if increasing "render scale" in params->display helps?