The physics in Fallout 76 seem to be tied to the framerate. Players in the current Fallout 76 B.E.T.A on PC discovered that by unlocking the framerate (which is locked in the beta, and can be changed in the .ini file) they can run much faster than others. Looking at the ground can also literally make you move faster.
Bethesda confirmed to Polygon that they are aware of the issue and will fix the problem in time for the full launch.
Fallout 76 releases November 14th on PC, PlayStation 4 and Xbox One.