Do progrssive rate springs experience changing spring rates due to how fast and/or hard they're compressed? Or does their rates change in the same manner regardless of the forces acting on them?

How are progessive spring rates achieved? By having the spacing between coils change through the spring?

I ask in regards to QA1 rear coilovers which can be used with a variable(same thing as progressive?) spring rate of 100-200. I want to know how it varies. On hard launch is the spring rate less to allow weight transfer and harder on slower acting forces such as some cornering loads?