fps capped at 30 fps

[what]

when i go fullscreen its at 30 fps but at windowed its 60 fps
anyone know how to fix this?

[Zekiran]

Only if you offer more information such as your hardware and resolution.

[Insomniac Jack]

You might want to change the value for "ipresentinterval" in fallout4prefs.ini.

Depending on your monitor's refresh rate, you're going to want to set "ipresentinterval=1" or "ipresentinterval=2". If you set it to 0, it will uncap your fps, but without certain mods, this last option might cause problems with the game.

[Zes]

IPresentInterval is a divider, It divides your monitor refresh rate and makes it your game's fps limit.

Your monitor = 60hz
IPresentInterval = 1
Your fps cap = 60/1 = 60

Setting it 2 on 60hz monitor will lock your fps to 30.. which is the actual problem here ;) maybe you should set it to 0.5 lol

[Iron Knights]

1) Set your monitor to 120hz or 144hz, vertical refresh frequency.
2) Disable V-sync in GPU driver and In Game.
3) Enable Enhanced Sync (AMD), Fast Sync (NVIDIA) in GPU Driver.
4) Turn ON Freesync / G-Sync on your monitor if capable.
5) Cap FPS in GPU driver to the frequency you set in (1).
Enjoy. You'll blast past the bad busy & slow areas of the game at a reasonable FPS.

[Elbmek]

My monitor loves 144mhz but 60 runs perfect on FO4