This will improve basically all details with the most notable being soft shadow quality being much more improved, however this will come at a bit of a cost.

Type run on the bottom right then copy and paste this

%LocalAppData%\DeadByDaylight\Saved\Config\WindowsNoEditor

Once you're there, click on GameUserSettings.ini

Now you'll see this in your notepad


[ScalabilityGroups]
sg.ResolutionQuality=100.000000
sg.ViewDistanceQuality=3
sg.AntiAliasingQuality=3
sg.ShadowQuality=3
sg.PostProcessQuality=3
sg.TextureQuality=3
sg.EffectsQuality=3
sg.FoliageQuality=3

Change the values of all of them except for ResolutionQuality to 4

That's all there is to do, now you can play your game with improved visuals.
As for performance I play it with uncapped fps and I was getting about 180 FPS on average with 100% resolution and the ultra preset on the survivor tutorial level since it was the most consistent.

When changing the values for better visuals I got about 135 FPS so there is a bit of a performance hit but I'm sure most mid to high end pcs will be able to handle it just fine, unless you're playing against doc of course but that hasn't been tested :)



My specs:
GPU: RTX 2080 SUPER OC
CPU: Intel Core i7 8700
RAM: Hyperx 16 GB