If they already exist, change them to the values below. Search for the following settings in the Fallout4.ini file located in Documents/My Games/Fallout4. TLDR: set Godrays to Low and Shadow Distance to Medium You will notice a slight difference in image quality as far as shadows go, but it was well worth the ~15 frames I reclaimed. I highly recommend turning these down to Medium and Low respectively. The two settings I have bolded, Shadow Distance and Godrays Quality, are absolute FPS killers for most machines. For instance, I don't like lens flare so I disabled it. They may or may not be the best possible settings for your rig and are subject to taste. I'm providing all of these only as a reference. I'm now perfectly satisfied with my performance, keeping a stable 60 FPS everywhere except Lexington and Diamond City, where I hit lows of about 55 FPS. Several things immediately jumped out to me as feeling off (mouse movement, character movement, framerate, etc.) so this post chronicles every tweak I made before finally reaching the point I'm at now. The first thing I did was turn God Rays to low, as I had read about it's large performance hit. When I first launched the game, the launcher set me to the High preset.
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