Fallout 4 Lag Fix Guide - Lag, Latency & Ping (UPDATED)

UPDATED: 22.09.2019  15:30



Fallout 4 is one of the coolest games out there right now, but like all things it has it’s flaws, from Slow Frame rates, Laggy Mouse Input, Game Launch Errors and Game Crashes.

But don’t worry we have the solutions to all this problems right here!

Fallout 4 Lag Fix Guide


Slow Frame rates

This one seems to be one of the most common problems with Fallout 4, comes from the fact that Bethesda decided to lock the game at 60 fps with V Sync.
60 fps is ideal but V Sync requires a lot of power so deactivating it will highly improve the game performance, however Bethesda didn’t actually give us an easy way to do this…

I’ve tried a couple of fixes and the best one so far is simply Downloading Fallout 4 Tweaker (which is a configuration tool) and use it together with Latency Optimizer 4.0.

With the tweaker you can change multiple things and among them is the ability to deactivate V Sync, once you deactivate V Sync within the application you need to change your gpu’s setting to Adaptive or Dynamic v Sync.

If you have an Nvidia card you simply go to the Nvidia Control Panel and look for the V Sync tab on the 3d Settings and activate Adaptive V Sync. If you have an AMD card you are going to have to download Radeon Pro, and just look for the V Sync options within it to activate Dynamic V Sync. 

Latency Optimizer on the otherhand assists you with:  

  • • Slight Optimization
  • • Speed test
  • • Disk Cleaner
  • • Startup Manager
  • • Free RAM
  • • Performance Recorder
  • • Control Panel
  • • Performance Tweaks
  • • 45 Tweaks & Tunes
  • • Automatic backup
  • • Packet Monitor
  • • Latency Test
  • • First Aid Kit
  • • System Cleaner
  • • Network Tweaks
  • • CPU boost


Laggy Mouse Input


Fallout 4 runs on the same engine as Skyrim did, and a consequence it has the same mouse lagging problems.

There is a simple way to deal with this which is just heading to C:\Users\yourusername\Documents\My Games\Fallout4. Open Fallout4Prefs.ini and then change the following parameters:


Also change:


To be sure, you should also change the iPresentInterval in Fallout4.ini, and make this files “Read Only” so they don’t get modified again.

Game Launch Errors

Many users are having problems launching the game in the first place and that can happen for multiple reasons. If you are having problems launching Fallout 4, the first thing you should do is update your graphics card’s drivers.

The problem also happens on computers running two graphics card because Fallout 4 doesn’t recognize them, if you are using two gpu you will have to make one of the two to be the primary gpu.

The process is not simple and will depend on the particular gpus you are using, so you should consult with either Nvidia or AMD support to get instructions for it.


Steam Failed To Start Fallout 4 Error

Even tho steam is basically the best thing that ever happened to gamers it has it’s own problems, many users have been receiving a message that reads “Failed to start game (unknown error)”
Which is basically the worst thing that can happen since it is an “Unknown Error” so you have no idea how to find a solution.

There are three possibilities that can get the game working for you, the first is simply running the game as Admin.

• To do this you will need to head into your Steam library, right click on Fallout 4, go into the properties of the game and locate the “Local Files Tab”.
Browsing your Local Files you will find the Fallout 4 application in your computer files, right click the application, head into its properties and check “Run this program as an Administrator”.
After you have done this just click “Apply” and try running the game.

• If this doesn’t fix the problem then try to run Steam as an Administrator. Go to your Steam install folder which should be located in: C:\Program Files (x86)\Steam).
Right click on the Steam application. Do the same as you did before to set Steam as “Run As An Administrator”, Apply and open Steam again to run Fallout 4.

And if all else fails you can also Verify the integrity of the Game Cache, which sounds a lot more complicated than it actually is…

All you need to do is go into your Steam Game Library, right click on Fallout 4 to access it’s properties, then head to the Local Files Tab and click “Verify Integrity of Game Cache


Fallout 4 Crashes and Game Freezing

This is probably the most common problems players are experiencing with Fallout 4…. Just like any Bethesda game Fallout 4 tends to crash and freeze and somehow it always feels like it happens in the worst possible moment.
So there are plenty of routes to take with this particular problem.

The absolute first thing you want to do is making sure your graphics card drivers are all up to date, so basically head to Nvidia’s or AMD’s website and get the latest driver for your graphics card.

If Fallout 4 is crashing often you might also want to lower your graphic settings, you might just be running out of resources….

If you get a message that reads “Problem Event Name: BEX64” when Fallout 4 crashes then what you need to do is Download the latest Visual C++ Distribution from Microsoft.


Fallout 4 Crashes and Freezing On Consoles

Finally for Xbox One And PS4 users that are getting Crashes, Bethesda has made it’s own official recommendations to fix crashes and freezes.

For Xbox One they have stated that players who get Game crashes should turn of the console, and unplug it for 10 seconds before reconnecting the whole console and running the game. If this doesn’t work they recommend reinstalling the game.
In the Case of PS4 Bethesda recommends restarting the game, power cycling the system and if none of those two work then just like with the Xbox, try reinstalling the game.


Final Thoughts

Fallout 4 is an awesome game but with some serious workload on your hardware, Bethesda didn’t make it any easier to tweak settings around for use and many problems exist because of it…

I have managed to make this guide so that almost all problems you may encounter have an easy solution.

So don’t take any less than the awesome game Fallout 4 is, and try some easy quick fixes for your game.


blog comments powered by Disqus