I installed this after building my first PC, and I'm not too familiar with what's considered a fast disk, though it's stored on a WD SN850X SSD. I've also just reapplied default transitions and tested waiting for the animation to pan the image, and the left side of the screen still becomes pitch-black for a bit after validation. If any footage would be helpful please feel free to let me know. I'll try and figure out what's causing this; I appreciate you and Faeran's replies! Sending the best of wishes.