How To Fix MouseLag Issue In Fallout 4 and Achieve 80FPS-120FPS at Max Settings and FXAA

Fallout 4 PC version suffers from MouseLag and low FPS issue but gamers can fix this issue by making some small changes to the "INI" files. We have listed below the fix for Fallout 4 MouseLag and Low FPS issues. Please note there is a separate fix for PC gamers who are using Nvidia cards.

Fallout 4

How to Fix Mouse Lag in Fallout 4:

Go to C:\Users\yourusername\Documents\My Games\Fallout4. Open Fallout4Prefs.ini and then change the following parameters:

iPresentInterval=1
to
iPresentInterval=0

Also change:

bForceIgnoreSmoothness=0
to
bForceIgnoreSmoothness=1

To be sure, you should also change the iPresentInterval in Fallout4.ini.

Fallout 4 Mouse Lag fix for Nvidia Graphics Card users:

Go to your Desktop, right click the Nvidia Logo at the lower Right of your Desktop. Choose "System Settings" or whatever it is in your Language. Now go to "3D Settings" and Add Fallout.exe to your Programs.

  • There change "Triple Buffer" to ON.
  • "Max frames render ahead" to 1.
  • And finally "V-Sync" on.

With the above Settings Fallout 4 runs at Max Settings and FXAA with 80 - 120FPS (120HZ Display) and no Mouselag / Tearing etc (already tested by me). I am running Fallout 4 with a NVIDIA 980 GTX.

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