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Completion Xp column?

OP Prophet of Cava

Does anybody know what the deal is with the completion column in the XP payout post game progress stats? On my first game today, i got nearly 3600 xp in that section alone. This last game, i finished top of my team, the game lasted 19 minutes (so full time) and i only got 667 for completion. Anybody know how to maximize this, or what this takes into account for?