https://www.polygon.com/2018/10/31/18047900/fallout-76-beta-speed-hack-exploit

Fallout 76 may suffer from a weakness in its graphics code, one that’s present in other games in the Fallout and Elder Scrolls series. That weakness, when exploited in the multiplayer-only online game, could allow PC players to move faster than they otherwise should.

Reports of the flaw showed up recently on Reddit. A user named watto33 said that they altered the .ini files in Fallout 76, a text document used to set parameters for launching the game. Such edits are common among PC enthusiasts, and can include tweaks that allow owners to play games in windowed mode or with additional hardware resources that might not otherwise be available in-game. More often than not, these kinds of modifications are not encouraged by developers.