Performance Index   

The Performance indicator displays an instrument’s price performance as a percentage. A Performance indicator shows the price of an instrument as a normalized value.
If the Performance indicator shows 50, then the price of the underlying instrument has increased 50% since the start of the Performance indicator calculations. Conversely, if the indictor shows – 50, then the price of the underlying instrument has decreased 50% since the start of the Performance indicator calculations.
Usage:
Performance index are helpful for comparing the price movements of different securities