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Another game released on UE5, another game the community has to fix just to get it to run decently on hardware that exceeds the recommended requirements and still suffers from major performance issues.
Fortunately, there's a solution—and while it won’t make your hardware perform twice as well, it definitely helps a lot.

Ultimate Engine Tweaks[www.nexusmods.com]

Credits to P40L0X[next.nexusmods.com] for taking the time to optimize this engine in nearly every game that uses it.

If this solution is very helpful to you, please consider donating[www.paypal.com] to support his work.


Depending on your setup, your performance could be negatively affected. You can try alternatives like:


by Hybred

or


by FrancisLouis

Both mods use less aggressive CVARs compared to Ultimate Engine Tweaks. It may be useful in some cases.

Installing the .ini file is simple:
Just copy and replace the file in:

To access the location without changing any Windows settings, simply press Windows + R and run the following command:

We're interested in performance without significantly sacrificing visual quality—and that's exactly what we're going to achieve.
All we need to do is download the .ini file (VRR or No VRR, your choice) from Nexus Mods and tweak a few settings to make it as optimized as possible.

First, uncheck the Read-only option and open the .ini file, then add the following three lines at the end, without the comments explaining what each one does:




Warning: Depending on your setup, performance may be worse after disabling virtual shadows, so try it and draw your own conclusions.
Sometimes it's better to have them turned on,

I do not recommend disabling it in the alternatives, as the distance of the cascade shadow is reduced since the Virtual Shadow does all the work and disabling it will only leave very poor shadows in distance and quality.


You can also try adding more experimental parameters that I haven’t tested, so I cannot guarantee better performance:








0 equals Low and 3 equals Epic in Unreal Engine 5.
I recommend testing values from 0 to 3 for each advanced setting and seeing which one best fits your needs.

Credits to the guide from PC Optimized Settings[pcoptimizedsettings.com]

The following CVars are used to enable frame generation without the need for external programs:


I recommend this method only if you don’t want to use OptiScaler. I prefer the other method because of the advantages it provides: better implementation of scaling technologies and AntiLag 2 via fakenvapi.


More information below.

Updating DLSS to the latest version is always the most optimal choice, especially in poorly optimized games or those with Frame Generation, since this technology is tied to DLSS on NVIDIA, as well as FSR for AMD.

We can use an easy method: download DLSS Swapper[github.com] and run it.

Once inside the application, it will load all the games in your library. What we’re interested in is updating METAL GEAR SOLID Δ: SNAKE EATER.



You just need to update both DLSS and DLSS Frame Generation libraries, although for now it’s better to do it manually since the latest recent update is not yet available in the tool.

DLSS 310.4.0[www.techpowerup.com]

DLSS Frame Generation 310.4.0[www.techpowerup.com]



If you want to update FSR, the method is exactly the same with the application, except now you’ll see AMD and Intel upscaling technologies.



I strongly recommend always updating these libraries to achieve the best possible performance when using upscaling or frame generation technologies.

The only issue caused by this .ini when disabling Virtual Shadows is that hair shading on characters will bug out during cutscenes or scenes where lighting shifts from dark to bright.



This can be fixed by deleting the following line of code from the .ini file. It appears twice—make sure to remove both instances:






Once you've made the changes, save the .ini file and set it back to Read-only.

WARNING — It may still cause some issues with hair when disabling virtual shadows, as the game isn’t fully designed to be played without this feature. Hopefully, this will be fixed in a future patch.

This line only appears in Ultimate Engine Tweaks, not in the alternatives.



This can be fixed by deleting the following line of code from the .ini file. It appears twice—make sure to remove both instances:

r.Nanite.Streaming.StreamingPoolSize=768

Before

Background rocks without textures

After

Problem solved. Remember to save the .ini file and set it back to Read-only.

Fixed in the latest Ultimate Engine Tweaks update.

Before

After

It's not a huge performance boost, but it does improve stability.
If you don’t want to disable Virtual Shadows, this is the best option to enjoy the game without nasty stutters.





This is the kind of performance difference we care about, since the game is capped at 60 FPS by default and unlocking it only leads to bigger issues.
Nothing we can do for now—just have to wait for the modding community to fix what Konami won’t.

We can also use Frame Generation thanks to OptiScaler.

The installation is simple; just download it from the official repository[github.com] and extract the files to:



Once extracted, run the setup_windows.bat file. Don't worry, it's not a malware. We just downloaded it from the official repository.



Select option 1. If you're using ReShader, you can try different options until both work together.



Here, select the number corresponding to your graphics card. In my case, it's AMD, so it will be number 1.



It’s very important to select the first option here as well if your motherboard is AMD or Intel; otherwise, Frame Generation will be used with FSR, and this results in quality loss due to the lack of native resolution support.



That's it. Simple, right? You're pretty good! Now let's move on to the game settings.





Simple, if you see the following message on the side of the screen when you launch the game, everything is working correctly.





Inside the graphics options menu, select DLSS, even if your graphics card is not NVIDIA. Save the settings by pressing the Esc key.

Press the Insert key to open the OptiScaler configuration panel.



In my case, I select FSR 3.X as the upscaler because I have an AMD graphics card, and OptiScaler's implementation is much better than the native one in the game.



Select OptiFG and save the .ini file by pressing the Save INI button. Restart the game, and you should have the Frame Generator options enabled.



OptiScaler disables external overlays by default when you enable Frame Generation. To re-enable it, you just need to modify a line in the OptiScaler.ini file located in the folder where you extracted it.



Change the value to:


Save the file, then open the game.



Once inside the game, press the Insert key again. You'll see that Frame Generation is enabled and ready to be activated.



Select Active, Extended, Allow Async, and HUDFix, save the .ini file again using Save INI, and that's it; the process is complete.






If you see FG instead of FPS in the Steam interface, congratulations, you've successfully enabled Frame Generation.

The downside of using Frame Generation in every game is the input lag and the inconsistency between the real frames and the generated ones. This section is focused on implementing AntiLag 2 into OptiScaler and taking advantage of that technology, even if we have a graphics card that doesn’t support it natively.

Method only valid for AMD graphics card
RX 5000 and newer, tested on an RX 6800 XT

First, we need fakenvapi[github.com] from OptiScaler’s official repository.
The installation is the same as OptiScaler: just copy and paste it into the folder where the executable (MGSDelta-Win64-Shipping.exe) of our game is located:



Once copied, we need to download the latest updated NVIDIA DLSS library. We can get it from TechPowerUp[www.techpowerup.com], make sure to download the latest version (as of today it’s 310.4.0)

Same procedure: copy and paste



Important—pay attention here: once extracted, rename the file to nvngx.dll (if you don’t see the .dll at the end, you don’t need to add it yourself, in that case it should only be nvngx)


Finally, we’re going to modify the OptiScaler configuration file, remember it’s OptiScaler.ini, and we’re going to change a single parameter to make sure it loads the .dll we just extracted:



Change the value to


Save the file and run the game.




If everything went well, you should now notice that in the OptiScaler panel there is a new section called fakenvapi



Now all that’s left is to configure it, for that we go to the tab that says Force Reflex and expand it



Select Force Enable and save the .ini file with the Save INI button.

That’s it, we just need to verify that it’s working correctly. There’s no need to restart the game for that.




To make sure AntiLag 2 is implemented in our game, we must press the combination Alt + Shift + L inside the game five times until you see three values in the following order:



If the interface doesn’t show up, or only the FPS value appears, repeat the procedure. If the counter is only limited to FPS, it means you have AntiLag enabled from the AMD control panel, either specifically for the game or globally.

That’s all, I strongly recommend this extra procedure if you’re using OptiFG for a better experience.

This may be a bit of a tedious method after tweaking so many things to get everything else working, but believe me: it’s totally worth it.

For this, we need to modify the Engine.ini and enable frame generation for NVIDIA and Reflex mode just like in the method above:


Once that’s done, we need to download dlssg-to-fsr3[www.nexusmods.com](not the DLSSTweakers Edition nor the Universal one, just the normal one) and extract only the file dlssg_to_fsr3_amd_is_better.dll into the same folder where we installed OptiScaler. (Important, do not replace nvngx.dll)

When running it, go to the OptiScaler configuration panel by pressing the Insert key, change the method from OptiFG to FSR-FG via Nukem's DLSSG, and save the .ini with the Save INI button.





If the procedure went well, you should see DLSS in Steam’s built-in FPS counter.



You can choose to select Fix broken visuals if you are still experiencing visual glitches due to Frame Generation.

— Unlocks the default 60 FPS cap (experimentally, at least for now) and adds some much-appreciated quality-of-life improvements, such as providing a fix for Ultrawide screens and skipping the long Konami intro.

Let’s hope Konami officially fixes the issues (haha, yeah right—but hey, at least the modders actually do) and soon.
For now, this is what we’ve got. If I come across any new issues or fixes myself, I’ll update the guide to contribute my small part to the community.

Lastly, I hope this guide has been helpful and that you can fully enjoy a timeless masterpiece that is unfortunately currently overshadowed by the game engine Konami chose to use.

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⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀Commencing Virtuous mission... now.

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