grenv: You said "the fact he has 200 games now is vitally important. In this case he will be twice as slow because he has twice as many games". I respectfully suggest that you are making a huge assumption that isn't necessarily correct. It may mean the player knows they have some time off so want some more games, or the 100 games weren't nearly enough to keep them busy. It also doesn't take into account the type of game being played. 100 new chess games is completely different than 100 new Ludo games. The player may be one who moves once a day in each game no matter what. Just because their game load doubled does not mean he will be twice as slow. There are too many variables involved to make that jump.

Oh and playBunny I had to look up outlier myself.
Outlier- a statistical observation that is markedly different in value from the others of the sample