I do find it humorous that I'm going to pay north of 80k for the same car a friend paid 54k for except I'll have red paint on the brake calipers, an extra motor up front, and a spoiler... And that mine was built in a tent. I'm still buying it though.
Given that there are 3 Model 3 GA lines you don't know which your car will be built on. And we don't know what all you get as part of the performance upgrade. But you get larger wheels with better tires, larger brakes, better motors (both and back), a spoiler, aluminum pedal covers, and a software tune to get better performance. The suspension is likely different as well.
And who knows, since it has the same rated range the battery could have slightly more capacity to make up for the extra weight.