Why do all previews render the same time within a profile

I am surprised that once a profile is chosen and I change sharpness from 0 to 100 it still generates in the same time

The only difference is when I choose another profile it also shows that Theia takes far longer than artemis or proteus despite the last one has many more sliders

I cannot otherwise conclude that Theia does a far better job detailing each frame and protheus seems some kind of middle of the road even with non automatic such as relative to auto any slider adjustments is twice as fast as theia

Hence I belief Theia does a much in cdepth job for both theia fidelity and theia details