Debian Bookworm itself is mostly made up of incremental updates of the software that was in the previous Debian Bullseye release. There are a few small changes — have a look here for the list — but they mostly won’t affect Raspberry Pi users. So Bookworm itself really hasn’t resulted in many changes.
However, for the last year or so we have been working on some major architectural changes to the Raspberry Pi Desktop, and these are launched for the first time in the Bookworm release. And this is where you might notice some differences.
With this new release, Raspberry Pi OS moves to Wayland and a Wayfire desktop, but it looks and feels exactly the same as what came before with X.Org. It now also comes with Pipewire, as well as an up-to-date version of Firefox that has been modified in cooperation with Mozilla to make better use of the hardware features found in the Pi.
> as well as an up-to-date version of Firefox that has been modified in cooperation with Mozilla to make better use of the hardware features found in the Pi.
Given your repeated attention to linux firefox’s problems with hardware video acceleration, it may be worthwile to mention:
> One key feature has been enabling V4L2 codec support so that Firefox can utilise the hardware h.264 decoder on Raspberry Pi. On older models of Raspberry Pi, this significantly improves performance and reduces CPU load when playing back HD video. We’ve enabled support for Widevine DRM, which is used by a number of video streaming services, and have contributed graphical optimisations that improve performance on a range of websites on low-power devices.
Pretty big improvement for pi desktop users ^_^
BTW one thing worth mentioning is that Raspberry PI 3 and older devices won’t run Wayland but X11 instead:
https://www.tomshardware.com/news/raspberry-pi-5-compatible-os-bookworm-officially-released
As usual, Raspberry Pi 3 users are getting the shaft.