Your Performance Target (also called a Profit Target) is the minimum Bankroll growth, or profit, you need to achieve within a level to pass it. Progress is calculated by aggregating the results of all your Settled Picks in the level — total amount won minus total amount lost.
Example: A level's Performance Target is $150. So far 5 picks have settled in the level, with 3 winning picks generating $300 in total winnings and 2 losing picks generating $200 in total losses. Progress toward the Performance Target is $100, or 67% ($300 won − $200 lost = $100 profit; $100 profit / $150 required = 67% progress).
For the exact Performance Target percentage at each level, see How do targets and levels work?