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I used to have a 99 Buick GS that was supercharged and had a button in it called, "activate Performance Shift." I really couldn't tell if there was a difference or not, but I wish the C7 had a button just like my old one to activate the performance shift function.
Since there is no button, I figured out how to activate performance driving mode when I want. Going above 25mph if you smash the peddle to the floor then let it go as fast as you hit it, the car won't have enough time to shoot your forward, but it will activate the performance driving mode. I thought I would pass that on since I hadn't heard of it before and it is fun to play with.