Short games are not awarding S grades as they should

Beating your opponents so hard that they surrender at minute 20, that's worth an S much more than from a 50-minutes game. I heard the grades system is based on the average players performance, well if it is not proportional to the duration of the game, then obviously you can't get enough cs/kills within 20 minutes to get that S. + count 2 drakes and herald
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