Fallout 4 Tweaking

With an accessible configuration file there's plenty of opportunity to tweak Fallout 4's settings, pushing them beyond their defined maximum values to further increase image quality, assuming you have the necessary hardware of course.

First, configure settings in the launcher to your liking, then exit out. Head to C:\Users\USERNAME\Documents\My Games\Fallout4 and backup Fallout4Prefs.ini. Open Fallout4Prefs.ini with a text editor, such as Notepad++, and edit one or more of the values described below. Save your modified file and reload the launcher, but this time simply press "Play" and do not re-enter the options portion of the tool, otherwise your changes may be overridden.

Actor Fade Tweak

Earlier we detailed the negligible improvement to image quality when utilizing the highest levels of the Actor Fade setting, due to the now-visible characters being only a few pixels in size as they are located some distance from the player. The one upside is the near-complete removal of fade-in and pop-in of these actors, but given the number of objects strewn about the world, and the undulating terrain, opportunities to see the full benefit of the setting are few and far between.

Nevertheless, if you wish to further increase the view distance of actors, modify fLODFadeOutMultActors= [Ultra-detail value: 15].

Decal Quantity Tweaks

With Ultra Decal Quantity enabled we've yet to encounter a situation where the setting needed to be raised. But higher it can go by modifying the following values:

uMaxDecals= [Ultra value: 1000]
uMaxSkinDecals= [Ultra value: 100]
uMaxSkinDecalsPerActor= [Ultra value: 40]

Distant Object Detail Tweaks

The first tweak of note in Fallout 4 enables you to increase the view distance, visibility, and quality of distant objects. With a few values doubled you'll see trees on distant hills, distant pylons, distant buildings, a higher level of detail on select game elements, and more detailed terrain.

Fallout 4 - Distant Object Detail Tweak Interactive Comparison #001

Caveat: some objects in the foreground may be negatively affected. As you can see in our comparison, the large white building regressed in quality, but this is the first and only time we saw that occur. If you're still happy to proceed, here are the values you need to change:

fTreeLoadDistance= [Ultra value: 75000.0000]
fBlockMaximumDistance= [Ultra value: 250000.0000]
fBlockLevel2Distance= [Ultra value: 110000.0000]
fBlockLevel1Distance= [Ultra value: 90000.0000]
fBlockLevel0Distance= [Ultra value: 60000.0000]

fSplitDistanceMult=1.5000 also exists within the same group of settings, but in our tests had no noticeable impact on image quality when the value was increased.

Performance: Doubling the Ultra values costs around four and a half frames per second in areas with oodles of extra distant detail.

Fallout 4 PC - Distant Object Detail Tweak Performance
Aforementioned config values were doubled for our tweaked screenshot and performance test.

Our verdict: a must have, assuming there are no further graphical anomalies.

Godrays Quality Tweaks

The presets for our Volumetric Lighting effects balance image quality and performance to enable a wide array of systems to enable the transformative Godrays Quality. Using the in-game console, accessible via tilde, the ~ key left of "1" on most English-language keyboards, you can adjust the parameters of the setting to increase or decrease image quality and performance.


GR on/off: enables and disables the setting
GR quality 0/1/2/3: switches between the Low, Medium, High and Ultra presets in real-time, in-game. Lower-quality presets use quarter-res downsampling, while Ultra (3) uses half-res downsampling
GR scale [number]: adjust the intensity of the light source and increase the size of God Rays and light volumes. Recommended only for screenshot taking
GR fog 0/1: enables and disables fog
GR fogcolor r g b: adjusts the fog absorption color, which affects scattering. Can be set to any RGB value
GR info: displays the current God Ray settings
The above options are useful for those examining Godrays Quality in closer detail, or wanting to test performance. GR grid, in contrast, enables actual tweaking of the setting's image quality and performance.

At its most basic, GR grid can be thought of as a way to improve the quality of existing God Rays and add additional rays, and vice versa. The default value is 64, and by increasing the value the quality of Volumetric Lighting is increased.

In addition to the obvious image quality improvement, tweaking can decrease the visibility of flickering that is occasionally observed when God Rays shift with a time of day change, or when viewed through moving objects, such as trees blowing in the wind. This rarely occurs on Ultra, but on Low it is often evident, as this video demonstrates (the video also highlights the blurriness that can occur when Low-quality Volumetric Lighting comes into contact with transparencies, certain pieces of geometry, and select objects). For comparison, here's an Ultra quality video.

To demonstrate the tweak's impact here are a new set of interactive comparisons:

Fallout 4 - God Rays Quality GR Grid Size Tweak Interactive Comparison #006

Fallout 4 - God Rays Quality GR Grid Size Tweak Example #006 - God Rays Quality GR Grid Size Tweak 1024 Fallout 4 - God Rays Quality GR Grid Size Tweak Example #006 - God Rays Quality GR Grid Size Tweak 512 Fallout 4 - God Rays Quality GR Grid Size Tweak Example #006 - God Rays Quality GR Grid Size Tweak 256 Fallout 4 - God Rays Quality GR Grid Size Tweak Example #006 - God Rays Quality GR Grid Size Tweak 128 Fallout 4 - God Rays Quality GR Grid Size Tweak Example #006 - God Rays Quality GR Grid Size Tweak 64 Fallout 4 - God Rays Quality GR Grid Size Tweak Example #006 - God Rays Quality GR Grid Size Tweak 32

Interactive Comparisons
64 (Default) vs. 1024	64 (Default) vs. 512	64 (Default) vs. 256
64 (Default) vs. 128	64 (Default) vs. 32	1024 vs. 512
1024 vs. 256	1024 vs. 128	1024 vs. 64 (Default)
1024 vs. 32	512 vs. 256	512 vs. 128
512 vs. 64 (Default)	512 vs. 32	256 vs. 128
256 vs. 64 (Default)	256 vs. 32	128 vs. 64 (Default)
 	128 vs. 32
As you undoubtedly noticed there are diminishing returns above 64, the default value applied by the Ultra preset. Behind the scenes however fidelity is increasing greatly. You just can't see it:

Fallout 4 - God Rays Quality GR Grid Size (Debug View #1) Tweak Interactive Comparison #006

Fallout 4 - God Rays Quality GR Grid Size (Debug View #1) Tweak Example #006 - God Rays Quality GR Grid Size (Debug View #1) Tweak 1024 Fallout 4 - God Rays Quality GR Grid Size (Debug View #1) Tweak Example #006 - God Rays Quality GR Grid Size (Debug View #1) Tweak 512 Fallout 4 - God Rays Quality GR Grid Size (Debug View #1) Tweak Example #006 - God Rays Quality GR Grid Size (Debug View #1) Tweak 256 Fallout 4 - God Rays Quality GR Grid Size (Debug View #1) Tweak Example #006 - God Rays Quality GR Grid Size (Debug View #1) Tweak 128 Fallout 4 - God Rays Quality GR Grid Size (Debug View #1) Tweak Example #006 - God Rays Quality GR Grid Size (Debug View #1) Tweak 64 Fallout 4 - God Rays Quality GR Grid Size (Debug View #1) Tweak Example #006 - God Rays Quality GR Grid Size (Debug View #1) Tweak 32

Interactive Comparisons
64 (Default) vs. 1024	64 (Default) vs. 512	64 (Default) vs. 256
64 (Default) vs. 128	64 (Default) vs. 32	1024 vs. 512
1024 vs. 256	1024 vs. 128	1024 vs. 64 (Default)
1024 vs. 32	512 vs. 256	512 vs. 128
512 vs. 64 (Default)	512 vs. 32	256 vs. 128
256 vs. 64 (Default)	256 vs. 32	128 vs. 64 (Default)
 	128 vs. 32
These wireframe comparisons show the ever-improving quality applied by GR grid, but as you can see in the Volumetric Lighting-only images below that improvement doesn't translate to an observable improvement beyond 256.

Fallout 4 - God Rays Quality GR Grid Size (Debug View #2) Tweak Interactive Comparison #006

Fallout 4 - God Rays Quality GR Grid Size (Debug View #2) Tweak Example #006 - God Rays Quality GR Grid Size (Debug View #2) Tweak 1024 Fallout 4 - God Rays Quality GR Grid Size (Debug View #2) Tweak Example #006 - God Rays Quality GR Grid Size (Debug View #2) Tweak 512 Fallout 4 - God Rays Quality GR Grid Size (Debug View #2) Tweak Example #006 - God Rays Quality GR Grid Size (Debug View #2) Tweak 256 Fallout 4 - God Rays Quality GR Grid Size (Debug View #2) Tweak Example #006 - God Rays Quality GR Grid Size (Debug View #2) Tweak 128 Fallout 4 - God Rays Quality GR Grid Size (Debug View #2) Tweak Example #006 - God Rays Quality GR Grid Size (Debug View #2) Tweak 64 Fallout 4 - God Rays Quality GR Grid Size (Debug View #2) Tweak Example #006 - God Rays Quality GR Grid Size (Debug View #2) Tweak 32

Interactive Comparisons
64 (Default) vs. 1024	64 (Default) vs. 512	64 (Default) vs. 256
64 (Default) vs. 128	64 (Default) vs. 32	1024 vs. 512
1024 vs. 256	1024 vs. 128	1024 vs. 64 (Default)
1024 vs. 32	512 vs. 256	512 vs. 128
512 vs. 64 (Default)	512 vs. 32	256 vs. 128
256 vs. 64 (Default)	256 vs. 32	128 vs. 64 (Default)
 	128 vs. 32
Performance: Tweaking down to 32 increases your performance by a few frames, and tweaking up to 128 decreases performance slightly. Beyond 128, performance rapidly plunges:

Fallout 4 PC - God Rays Quality Tweaks Performance

32 really isn't recommended due to the increase in flickering. If you're struggling for performance, instead select a lower-quality preset and then try increasing GR grid to counteract the loss of image quality. This may result in a superior experience.

For those with performance to spare, increase GR grid to 128. If there's still spare performance, look to raise another setting, like uGrids.

Grass Fade Tweak

In previous Bethesda games, adding extra grass to terrain helped considerably due to the lack of clutter and objects. In Fallout 4 there are objects galore, trees, and pieces of foliage unaffected by the Grass Fade setting, creating a varied landscape that doesn't rely solely on grass for variety and detail. Nevertheless, those seeking the definitive level of image quality can increase grass rendering distances to make Fallout 4 look that bit nicer.

Fallout 4 - Grass Fade Tweak Interactive Comparison #001 - 14,000

The values to change:

fGrassStartFadeDistance= [Ultra value: 7000]
fGrassMaxStartFadeDistance= [Ultra value: 7000]

The maximum value that bestows any benefit is 14000, unless you tweak the uGrids value, which we'll get to later, to add additional full-detail gameplay cells. If you do tweak uGrids, you can increase the value to 28000 to blanket every millimeter of suitable terrain with grass.

Fallout 4 - Grass Fade Tweak Interactive Comparison #001 - 28,000 with uGrids 11

Performance: Adding some extra grass doesn't cost all that much. uGrids in this scenario, however...

Fallout 4 PC - Grass Fade Tweaks Performance

Item Fade Tweak

As was the case with Actor Fade, there's little benefit to tweaking Item Fade due to the ever-decreasing size of newly-added distant items (a bucket looks like a silver pixel at 200 meters, for instance).

If you wish to tweak it regardless, change fLODFadeOutMultItems= [Ultra value: 15].

Object Fade Tweak

As objects run the gamut from houses to cars, to vending machines and fences, tweaking Object Fade beyond the in-game maximum can increase detail on distant views if you tweak uGrids. Depending on the scene you may see additional vehicles, or only a trash can that looks like a dot at distance. Your mileage may very, in other words.

For the tweak to kick-in, change fLODFadeOutMultObjects= [Ultra value: 15]. And check out our tweaking summary to see the minor improvement in a max-setting scenario.

Particle Tweaks

Particles form the basis of many weapon effects, and other visual effects such as explosions, smoke, and fire. To adjust the maximum number that can be rendered simultaneously, tweak =iMaxDesired [Ultra value: 750].

We've yet to observe any benefit to raising the setting, but one likely exists, or will exist when modders create massive battles as they did in previous Bethesda games.

Screen Space Reflections Tweaks

Using the in-game console, accessible with the tilde key (~), left of "1" on most keyboards, you can adjust a number of Screen Space Reflection (SSR) parameters to modify their appearance:


SSRI [number] (default: 1): adjust the intensity of SSR
SSRBP [number] (default: 1): adjust the blending power of SSR
SSRAT [number] (default: 0.2): adjust the angle threshold of SSR
SSREFF [number] (default: 0.2): adjust the edge fade factor of SSR
SSRVBP [number] (default: 50): adjust the vertical blur power of SSR
SSRVAP [number] (default: 2): adjust the vertical alignment power of SSR
SSRVSP [0.0-1.0] (default: 0): adjust the vertical stretching power of SSR
SSRRSS [number] (default: 8): adjust the ray step scale of SSR
Once you've settled on a combination of settings that you like, take a note and add them to a text (.txt) file, with one command on each line. Place the file in your game install directory where the Fallout4.exe is located, and when you're next in-game type bat [filename] to execute the changes.

Shadow Distance Tweak

Earlier, we explained that as Shadow Distance increases the fidelity and detail level of shadows decreases. The maximum values set by the game launcher are fShadowDistance=20000.0000 and fDirShadowDistance=20000.0000, and on High the value is reduced to 14000.

At 20000 shadows begin to lose definition, and at 14000 a few too many distance shadows are removed. Instead, we'd recommend you tweak the value to 17000 for a better balance between distance and detail during general gameplay.

From overlooks, such as those shown in our comparisons below, some distant shadows are visibly removed, but during ground-level gameplay the improvement to image quality from 17000 is appreciable.

Fallout 4 - Shadow Distance Tweak Interactive Comparison #002

Fallout 4 - Shadow Distance Tweak Example #002 - Shadow Distance 40000 Fallout 4 - Shadow Distance Tweak Example #002 - Shadow Distance 30000 Fallout 4 - Shadow Distance Tweak Example #002 - Shadow Distance 20000 (Default) Fallout 4 - Shadow Distance Tweak Example #002 - Shadow Distance 17000

Interactive Comparisons
40000 vs. 30000	40000 vs. 20000 (Default)	40000 vs. 17000
30000 vs. 20000 (Default)	30000 vs. 17000	20000 (Default) vs. 17000
Note how 30000 and 40000 add a nice fat shadow around the highway, at the expense of shadow definition just about everywhere else.

Shadow Quality Tweak

To give shadow quality a big boost, and increase the visibility and fidelity of distant shadows, increase iShadowMapResolution= from 4096 to 8192.

Fallout 4 - Shadow Quality Tweak Interactive Comparison #001

Some nearby shadows are unnaturally sharp, but given the general screen-wide increase to image quality it's a minor quibble.

Fallout 4 - Shadow Quality Tweak Interactive Comparison #002

Performance: Shadow Quality is one of the most expensive Fallout 4 settings, and doubling its detail level once more understandably impacts performance by a fair margin.

Fallout 4 PC - Shadow Quality Tweak Performance

uGrids Tweak

In Skyrim, when you looked across a vista or down on a city from an elevated position you could see for miles and miles, albeit with a variable level of detail. If everything in the visible area were loaded at full quality the vast majority of systems would be unable to maintain any degree of performance, and may even crash. To limit what could and could not be shown, the game world was broken into squares (uGrids), and around the player 5 full-detail uGrids were loaded simultaneously.

With tweaking we could increase the number of uGrids loaded, but as Skyrim was a 32-bit .exe, and most GPUs had at max 2GB of VRAM, performance and stability was poor above 7 uGrids as players frequently ran out of RAM, VRAM, and general CPU and GPU horsepower.

For Fallout 4, the game engine has received a 64-bit upgrade, solving RAM issues; GPUs now have significantly more VRAM, and 2015 hardware is leagues ahead of what we had back in 2011. In other words, uGrids are now legitimately usable, and stable, all the way up to and including uGrids 13, improving image quality and detail draw distances substantially. Take a look at the comparisons below to see what we mean.

Fallout 4 - uGridsToLoad Tweak Interactive Comparison #001

Fallout 4 - uGridsToLoad Tweak Example #001 - 13 uGrids Fallout 4 - uGridsToLoad Tweak Example #001 - 11 uGrids Fallout 4 - uGridsToLoad Tweak Example #001 - 9 uGrids Fallout 4 - uGridsToLoad Tweak Example #001 - 7 uGrids Fallout 4 - uGridsToLoad Tweak Example #001 - 5 uGrids (Default)

Interactive Comparisons
uGrids 13 vs. uGrids 11	uGrids 13 vs. uGrids 9	uGrids 13 vs. uGrids 7
uGrids 13 vs. uGrids 5 (Default)	uGrids 11 vs. uGrids 9	uGrids 11 vs. uGrids 7
uGrids 11 vs. uGrids 5 (Default)	uGrids 9 vs. uGrids 7	uGrids 9 vs. uGrids 5 (Default)
 	uGrids 7 vs. uGrids 5 (Default)
At medium distances significant improvements can be found, too.

Fallout 4 - uGridsToLoad Tweak Interactive Comparison #002

Fallout 4 - uGridsToLoad Tweak Example #002 - 13 uGrids Fallout 4 - uGridsToLoad Tweak Example #002 - 11 uGrids Fallout 4 - uGridsToLoad Tweak Example #002 - 9 uGrids Fallout 4 - uGridsToLoad Tweak Example #002 - 7 uGrids Fallout 4 - uGridsToLoad Tweak Example #002 - 5 uGrids (Default)

Interactive Comparisons
uGrids 13 vs. uGrids 11	uGrids 13 vs. uGrids 9	uGrids 13 vs. uGrids 7
uGrids 13 vs. uGrids 5 (Default)	uGrids 11 vs. uGrids 9	uGrids 11 vs. uGrids 7
uGrids 11 vs. uGrids 5 (Default)	uGrids 9 vs. uGrids 7	uGrids 9 vs. uGrids 5 (Default)
 	uGrids 7 vs. uGrids 5 (Default)
And combined with the Grass Fade tweak, grass view distance and general image quality can be raised even at short range.

Fallout 4 - Grass Fade Tweak Interactive Comparison #001 - 28,000 with uGrids 11

Before you sprint off to change uGridsToLoad=, please note that uGrids can alter your game and save data, and reverting to a previous uGrids value at a later date may break your save. Mods like Stable uGridsToLoad were eventually developed for Skyrim to workaround these issues, and before that we had this manual fix, which appears to also work in Fallout 4:

Start Fallout 4 and load up a saved game
Use ALT+TAB to switch out of Fallout 4 and back to your Desktop
Edit the Fallout4Prefs.ini file as normal, modifying the uGridsToLoad variable to the desired lower value. Save Fallout4Prefs.ini and close it
Use ALT+TAB to switch back to Fallout 4
Open the Command Console using the tilde (~) key and type refreshini
Save your game to a new save slot, and it should now have the correct new uGridsToLoad value
If you're concerned about breaking your game and losing progress simply wait for a foolproof mod or script, as was developed for Skyrim. If however you like to walk on the wild side, backup your saves and config files and enjoy the massively improved image quality.

Performance: Loading extra uGrids adds additional high-quality detail across your field of view, and so has a sizable performance impact. It also requires vast amounts of RAM and VRAM - our tests frequently saw 6GB of RAM and VRAM in use at 1920x1080, with uGrids maxed out at 13.

Fallout 4 PC - uGridsToLoad Performance

If you have performance to spare, and the requisite hardware, tweaking uGrids will have the single largest impact on image quality of any Fallout 4 tweak or game setting.

Water Tweaks

You can't increase the quality of water in Fallout 4, which appears to have three set-in-stone LoD levels, but you can turn off several of its features to improve performance on slower systems. To do so, simply change "1" to "0" on the following config file lines:

bUseWaterDisplacements=1
bUseWaterRefractions=1
bUseWaterReflections=1
bUseWaterDepth=1

NVIDIA Dynamic Super Resolution

To increase the quality of your graphics even further, activate Dynamic Super Resolution (DSR) to receive up to 4K-quality graphics on your HD monitor. How it works is simple: compatible games, such as Fallout 4, are rendered at a higher, more detailed resolution, and the image intelligently shrunk back down to the resolution of your monitor using a custom-made filter, giving you up to 4K-quality graphics on your screen. The video below explains more, and the images show how to activate the setting in the NVIDIA Control Panel.



Fallout 4 NVIDIA Control Panel DSR #1 Fallout 4 NVIDIA Control Panel DSR #2

With DSR enabled, textures benefit from improved clarity, aliasing is almost entirely eliminated, objects have better definition, vegetation is more detailed, and distant game elements are significantly clearer. If you've used DSR in other games you'll know of these benefits already, but if you haven't had the chance here's a look at how Fallout 4's graphics scale with rendering resolutions.

Fallout 4 - NVIDIA Dynamic Super Resolution Comparison

Fallout 4 - NVIDIA Dynamic Super Resolution Example #1 - 3840x2160 Fallout 4 - NVIDIA Dynamic Super Resolution Example #1 - 2560x1440 Fallout 4 - NVIDIA Dynamic Super Resolution Example #1 - 1920x1080 Fallout 4 - NVIDIA Dynamic Super Resolution Example #1 - 1600x900 Fallout 4 - NVIDIA Dynamic Super Resolution Example #1 - 1280x720

Interactive Comparisons
1920x1080 vs. 3840x2160	1920x1080 vs. 2560x1440	1920x1080 vs. 1600x900
1920x1080 vs. 1280x720	3840x2160 vs. 2560x1440	3840x2160 vs. 1600x900
3840x2160 vs. 1280x720	2560x1440 vs. 1600x900	2560x1440 vs. 1280x720
 	1600x900 vs. 1280x720
Even though DSR is of great benefit, in the case of Fallout 4 we'd recommend tweaking uGrids first as it adds actual detail, rather than 'simply' improving what's currently visible. If after tweaking uGrids you have performance to spare, increase your rendering resolution with DSR for the definitive level of image quality.

Performance: Using a reference GeForce GTX 980 Ti, we increased the DSR rendering resolution in our demanding benchmark that incorporates almost all of Fallout 4's graphics settings, demonstrating the most demanding moments of this enormous game.

Fallout 4 PC - NVIDIA Dynamic Super Resolution Performance

Overclocking

If you need extra performance, overclocking your CPU and GPU will pay dividends in Fallout 4 demanding open world. Learn how with the help of GeForce Garage.

Tweaking Wrap-Up

Above we've documented what we believe to be the most useful of tweaks. Many old favorites from Skyrim no longer work, numerous lines in the configuration file have no noticeable or positive impact on image quality, and of the hundreds of in-game console commands we're expecting the majority to be locked down in the retail release of the game. Those that remain will undoubtedly be tested by experienced Skryim modders, and should they find anything of note we'll be sure to update the guide.

Using the tweaks we have verified so far, we've already gained a considerable amount of detail as the interactive comparison below demonstrates.

Fallout 4 - uGridsToLoad Tweak Interactive Comparison #001

Fallout 4 - uGridsToLoad Tweak Example #001 - 13 uGrids(Fully Tweaked) Fallout 4 - uGridsToLoad Tweak Example #001 - 13 uGrids Fallout 4 - uGridsToLoad Tweak Example #001 - 11 uGrids Fallout 4 - uGridsToLoad Tweak Example #001 - 9 uGrids Fallout 4 - uGridsToLoad Tweak Example #001 - 7 uGrids Fallout 4 - uGridsToLoad Tweak Example #001 - 5 uGrids (Default)

Interactive Comparisons
uGrids 13 (Fully Tweaked) vs. uGrids 13 (Ultra Settings)	uGrids 13 (Fully Tweaked) vs. uGrids 11 (Ultra Settings)	uGrids 13 (Fully Tweaked) vs. uGrids 9 (Ultra Settings)
uGrids 13 (Fully Tweaked) vs. uGrids 7 (Ultra Settings)	 	uGrids 13 (Fully Tweaked) vs. uGrids 5 (Ultra Settings)
Air conditioners and other objects are visible on distant buildings, trees are rendered on the distant hill, which is now of a higher quality; a turret can be seen across the river, a character can be seen on the river boat, and everything just looks better.

Fallout 4 - uGridsToLoad Tweak Interactive Comparison #002

Fallout 4 - uGridsToLoad Tweak Example #002 - 13 uGrids(Fully Tweaked) Fallout 4 - uGridsToLoad Tweak Example #002 - 13 uGrids Fallout 4 - uGridsToLoad Tweak Example #002 - 11 uGrids Fallout 4 - uGridsToLoad Tweak Example #002 - 9 uGrids Fallout 4 - uGridsToLoad Tweak Example #002 - 7 uGrids Fallout 4 - uGridsToLoad Tweak Example #002 - 5 uGrids (Default)

Interactive Comparisons
uGrids 13 (Fully Tweaked) vs. uGrids 13 (Ultra Settings)	uGrids 13 (Fully Tweaked) vs. uGrids 11 (Ultra Settings)	uGrids 13 (Fully Tweaked) vs. uGrids 9 (Ultra Settings)
uGrids 13 (Fully Tweaked) vs. uGrids 7 (Ultra Settings)	 	uGrids 13 (Fully Tweaked) vs. uGrids 5 (Ultra Settings)
Performance:

Performance is unplayable with every single thing maxed out, as was the case when Skyrim first launched, but in time hardware will improve and many more will have the opportunity to take advantage of these tweaks and the graphics mods that will undoubtedly be developed. In the meantime, we'd recommend starting with uGrids 7 (if you're unafraid of potential issues), Shadow Quality, Distant Object Detail, and Grass Fade, in that order.

Fallout 4 PC - uGridsToLoad Performance

If you learn of any other benefical tweaks, be sure to let us know via the comments section.