Instead of attack/defence wave, you alternate.
Your win/lose will be much faster, you’ll earn ranked credits faster as well, but you can get lower scores, and get de-ranked faster as well.
It’s all about speed ranking/de-ranking; at least a lot better than quitters who demoralise the team 4 minutes into the game by being salty cause he’s playing vassili and no one is reviving him at the far back then quits.