How is it that no one knows this?
Since the issue is common between PUBG and Fortnite, it seems to be a quirk of the Unreal Engine, which both games run on. Generally, higher frame rates mean higher fire rates. That’s an especially big problem for Fortnite’s full cross-play setup, since 30fps targets on Switch and mobile are being pitted against 60fps on other consoles and potentially much higher numbers on PC.