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Grainy image

I’m testing out the differences between Lumen and Screen Space GI. Lumen looks great, but I have a scene where I need to use a lot of static lights. So when I switch the GI to Screen Space, the image, especially the shadows or when turning the camera is extremely grainy. I can’t seem to figure out what is causing this. Not sure if this is a UE5 issue, or a different setting that works differently than UE4.