How can I eliminate the noise coming from envlightthat appears in the Vulkan viewport? Increasing light samples in the light itself or in display settings only works up to a point.

I'm trying to match lighting quality of Substance Designer, where environment light doesn't produce any noise. And my reason is that noise obscures subtle texture details. Like on the attached screenshot, where gentle scratches are pretty much invisible at any angle, unless I zoom in the viewport significantly or drastically increase the size of the viewport pane.

Any advice?