From Digital Foundry:
Skyrim is back once again with a new 'Anniversary Edition' that not only adds new content but also gives a bit of bespoke attention to PlayStation 5 and Xbox Series consoles - replacing the need to use user mods or FPS Boost to get the game running at 60fps. Given we were already looking at 4K on PS5 and Series X, what's changed? And is Series S still running at 1080p? Actually, no!
Please Note: Despite resolution differences, performance differences and faster loading, Xbox Series isn't actually a native application - it's still built on the older XDK and is 'Gen 9 Aware'.