Under "activity" in the individual profile page, one can see how many games/puzzles one has played per time control/variant per day, and how many wins / draws / losses one has achieved. Given this, it should be rather easy to calculate the performance per time control / variants as it is done in arenas as well. Why not display it there as well? It would be way more indicative whether one lost less/more games due to weaker/stronger opposition or because one had a bad/good day, etc.
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