Quote - I have my min shading rate set to this as well, but sometimes I make it 0.00 if I want to see every detail on a texture, mainly for checking purposes - seams, that kinda thing ;o).

The relationship between the global setting and the individual actor values for shading rate, is that the renderer use the higher of the two values.
So setting the global value to 0.0 won't have much affect if you leave the actor values untouched.

To improve the speed for test renders you need to set it higher, say 1.0 or 2.0
For detailed renders you need to make sure you set the individual actor values as well as the global value.