You are right. The speed of the simulation is independent of the feeds in the GCode.
You can only choose the normal or the increased speed. But it is possible at any time by pressing the "Single" button in the toolbox to go into single step mode.
Then you can step through the program. I think this is best for your.
Please also note that during the roughing process the complete blade contour is not checked. This only happens during finishing.
You should always keep your finishing offset large enough.