Original Post — Direct link

Post is from 2018 and this issue still is somehow not fixed yet, but regardless here's your fix: https://www.reddit.com/r/fo76/comments/a0lc1o/borderless_window_mode_fps_problems/

External link →
about 2 years ago - /u/Ladydevann - Direct link

Raising this with the team! Thanks for bringing this up.