It appears Sony has been working on ensuring Astro's Playroom is fully optimized to run as quick as possible on the PlayStation 5's SSD, judging by two comparison clips taken from hands-on demonstrations. However, there are some naysayers who believe the PS5 performance improvement is all down to crafty editing.
https://www.notebookcheck.net/Astro-s-Playroom-comparison-appears-to-show-Sony-is-still-squeezing-out-every-last-drop-of-performance-in-the-PlayStation-5-ahead-of-retail-launch.496696.0.html