Performance upgrade Package, which is the bigger brakes, spoiler, 20 inch tires, upgraded pedals. When the model 3 performance was first released in mid 2018, beside the "faster speed", anything that was a visual indicator of a difference in the vehicles was part of a "performance upgrade package" that you had to buy separately for 5k.
After the end of the third quarter push (in 2018) they then made the performance upgrade package standard, and increased the price of the car a bit. In Q4 of 2018 (and going forward), the performance upgrade package was included in model 3 performance vehicles, however it was still called out on MVPAs.
No idea if it is still called out, but people still note those options as being part of the PUP.