I also have an RX 570. And I also get very low FPS.
In a test scene in UE4 with high-poly stones from Quixel, I have 160 FPS.
In UE5, if I turn off the new features of Nanite (for static mesh) and Virtual Shadow Maps, I have 94 FPS.
If I turn on Nanite and don’t turn on Virtual Shadow Maps, I have 110 fps.
If I turn on Nanite and turn on Virtual Shadow Maps I have 35 fps.
Lumen was always off.
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