PlayerUnknown’s Battlegrounds received some server-side updates recently on Xbox One, and Xbox One X to help with the myriad of performance issues in these versions.
This is true on both Xbox One, and Xbox One X. Performance in general is still erratic, though, and the presence of other players seems to cause more issues.
In one scene at the end of the video, both players are in the same spot firing at the same targets, but only Xbox One X can maintain 30fps.
PUBG developer PUBG Corp communicated some of these improvements when it released the first patch on Xbox One, but it seems more work has been done behind the scenes.