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When you add the extra horsepower you need to render it all in VR, it's a complete mess in places with a lot of rubble and clutter, so half the game seems horrible to play. The developers did a decent job pre-combining much of the scenery from thousands if tiny objects into a smaller number of larger objects in a lot of places, but when you are in certain areas of the map it's just not enough. Fallout 4's engine depends on brute strength from your graphics card a little too much.
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