Points Per Minute

From CC Wiki

Points Per Minute (PPM) is a statistic kept in the game history on the profile of users. It is the amount of points a user has divided by the number of minutes played. This is kept as a stat for every game separately, as well as for the games combined. A high PPM usually indicates a skilled player, since it means that he/she has managed to get relatively more points per game. It is usually based around the 1:1 to 2:1 ratio of points:minutes, though many rare cases have gone above the 2:1 mark. It obviously will depend on the game and its game type you were playing at the time. Other influencing factors include your level relative to the other players and how much of that specific game you've played.