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I think you guys need to first decide exactly what you mean by "fast player", then it should be easy to design the formula.
For example: To me, a fast player is a player who responds soon after I move. When I log on, it is usually my move in that game, and sometimes we are both online and we can make several moves in a row. If that's what you mean by "fast player" then just measure the average time between opponent's move and player's move in each game.
(gem) Hvis du klikker på en persons navn, og så på afsluttede spil får du en liste over spil som er færdige, klik så på navnet på spillet for at få et sammendrag over alle disse spil, og til sidst på navnet på spillet igen så får du et spil du kan se på og analysere. (Servant) (vis alle tips)