After syncing mirrors again i could run the updates, but pamac and thunderbird where horrible slow.
I run XFCE stable.
My sokution was to follow advices for the update hints in
2023-06-04
DKMS is currently broken as our kernels got compiled against an older gcc Many applications (firefox, thunderbird, telegram, etc) slow to start on desktops other than Gnome
There is a bug with xdg-desktop-portal-gnome (more details here ).
Workaround for gtk-based desktops (including Xfce)
sudo pacman -Rdd xdg-desktop-portal-gnome
sudo pacman -S xdg-desktop-portal-gtk
I asked ChatGPT about xdg-desktop-portal: