In the last game, I had a teammate with ping 200 who was frequently AFKing (probably connection issues), and who didn't follow the rest of the team and barely got any kills.

While it's obvious that nobody can predict how their internet connection is going to be, I think that adding a neat feature for people with high latency would be very useful for the whole team.

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Simply, when they want to queue a competitive game, add an "Are you sure you want to continue to a competitive game? Your internet connection is bad" popup, just like there is a popup when you want to exit the game. This would be very useful because then the poor people wouldn't impact the whole team's rank.