Fix mouse lag and low FPS issues in Fallout 4

The recently released action role-playing game, Fallout 4 has become extremely popular. It is available for PC and game consoles. On PC, it has a number of issues you might face. One of the issues is mouse lag. The mouse is not responsive for many users. Another issue is low frame rate. With my GeForce GTX 750 Ti, it gives only 30 FPS! Here is what you can do about it.
fallout 4 banner logoYou can try the following tweaks:

  1. Close the Fallout 4 game.
  2. Go to your game preferences folder. Usually it is located at:
    This PC\Documents\My Games\Fallout4

    If you are running Windows 7, go to

    C:\Users\your user name\Documents\My Games\Fallout4
  3. Double click the file Fallout4Prefs.ini. It will be opened in Notepad:fallout 4 prefs file notepad
  4. Find the line iPresentInterval=1
    Change it to

    This should fix the mouse lag issue.

  5. Find the line bForceIgnoreSmoothness=0
    Change it to

If you are an NVIDIA SVGA card owner like me, try the following steps:

  1. Go to your Desktop, right click the NVIDIA icon in the system tray (notification area) near the clock. Open the NVIDIA control panel.
  2. Now go to "3D Settings" and add Fallout.exe to your Programs.
  3. Then, apply the following tweaks:
    "Triple Buffer" to ON.
    "Max frames render ahead" to 1.
    And finally "V-Sync" on.

This should improve the game performance a lot.

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Author: Sergey Tkachenko

Sergey Tkachenko is a software developer who started Winaero back in 2011. On this blog, Sergey is writing about everything connected to Microsoft, Windows and popular software. Follow him on Telegram, Twitter, and YouTube.

11 thoughts on “Fix mouse lag and low FPS issues in Fallout 4”

  1. I thank you whosoever posted this , I am a gtx 750 ti user myself , and had horrible performane , but after i followed your tweaks , game runs extremely smooth ! I thank you a lot :)

  2. Thank you so much! I just changed iPresentInterval=1 to iPresentInterval=0 and it worked wonders! Game not only goes on smother but also loads faster!

    1. Keep looking, you’ll find it. Although when I found it the line was already filled in, so maybe if you change iPresentInterval maybe it automatically changes it.

  3. Even in a crisis, if there is one person who would manage to deliver impeccable results each and every time, it would have to be you. Thanks for your hard work and dedication while being someone that everyone can depend on.

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