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In a tweet from earlier this morning creative director of PUBG PlayerUnknown himself stated:
While I previously stated PUBG would run at higher FPS at XGP launch on 12/12, I want to clarify that PUBG will run at 30 FPS across all @Xbox One devices. We’re constantly refining the game & exploring options to increase FPS, but this early in dev, we’re unable to confirm more.
— PLAYERUNKNOWN (@PLAYERUNKNOWN) December 1, 2017
This could spell disaster for the XBOX release of the worlds most played steam game.