How to? XD 2.7 Preview Window efficiency

[Garth Thornton]

Is it correct to say that the smaller the scale of the object, the less resolution the preview window will compute?
Therefore is it not a personal preference between finding a balance with preview window "render" time (what else do you call it?) and how much detail is adequate?

For this reason I wondered if there is a meter or "percent completed" gauge of any sort?

The preview resolution is just its size in pixels, limited also by the simple method of shading. Since the preview has no higher detail available for anti-aliasing, the shading effect is quite coarse.

Since what you really care about is how long the full size render will take to be good enough, the preview speed is just a relative guide.

There is no completion of preview or render, it's up to you to decide what is good enough. The New Pixel rate is the only guide I have as to how much the image is changing, but before long most "new pixels" are just making the surface a tiny bit smoother.

Rendering larger will add more detail and take longer to fill in. Where it helps most is for reducing the size in an editor afterwards for anti-aliasing.