If you have a recent 75D model S or X that was built before July 2017, you can get it “uncorked” to the same performance as the post July 2017 ones now – it depends on components and age, but well worth checking.
For the model S 75D the 0-100 time is 4.4 seconds down from 5.5 seconds, and for the model X 75D, 5.2 seconds down from 6.5 seconds.
One owner had theirs done today, and has noticed a significant improvement in performance.
This is one of the really unique things about Tesla – how many other cars have you owned where months after the original purchase, you get a free power upgrade?