A drop-down menu is added to the "About Your Tesla" menu, which allows one to choose any version of the car that has ever been made. It is unclear if the Performance Mode Easter egg changes the car's behavior or display in any way beyond the menu itself. The "About your Tesla" menu can be accessed by tapping the Tesla "T" at the top of the touchscreen display.

This easter egg works on the Models S and X

To activate this easter egg: A prolonged (5 second) press of the Tesla "T" icon at the top of the touchscreen display results in a graphic which appears as a single water ripple away from the center of the "T" icon. Once the "T" is released, a text box is revealed along with a keyboard for entering text. The text box says "please enter access code" with a text entry field below and button options "OK" and "Cancel" below that. This text box is mainly used by service centers and showrooms for purposes such as service mode and showroom mode, but does also allow access to certain Easter eggs. Entering the word "Performance" and pressing "OK" will activate the Performance Mode Easter egg.