Dwight Lowery received the most in performance-based pay of any Colts player in the 2015 season.
Every year, the NFL hands out quite a bit of money in performance-based pay to players on every team. The idea behind the money is to compensate players in addition to their normal salary based on how much they played compared to their salary. The number of snaps played for each player is compared to the player's contract to determine a "player index" for that player, and then the player is compared to the other players to determine just how much performance-based pay he will get.