Basically, the Star Wars Jedi: Fallen Order update improves backwards compatibility performance specifically for the latest generation of consoles. You will find the release notes below. High-Level Summary of Features:
Improved framerate on Xbox Series X|S and PlayStation 5 Improved dynamic resolution ranges, for a higher resolution experience on Xbox Series X|S and PlayStation 5 Improved post-processing resolution for Xbox Series X and PS5. (Not Xbox Series S)
Console Specifics: Xbox Series S
Framerate has been increased to 60 FPS (up from 45 FPS)
Xbox Series X Performance mode
Framerate has been increased to 60 FPS Dynamic resolution added in the range of 1080p to 1440p
Xbox Series X Normal mode (non-performance mode)
Postprocessing has been increased to 4K Dynamic resolution in the range of 1512p to 2160p
PlayStation 5
Framerate has been increased to 60 FPS (up from 45 FPS) Postprocessing increased to 1440p Dynamic resolution has been disabled and the game is rendering at 1200p (up from 810-1080p)