First project opens extremely slow, then ok

Hello there,
it seems that since Cubase 10.0.40 Pro always the first project opens really slowly(>2minutes), even if there is not a lot of plugins/tracks going on.
Cubase itself opens as fast as always. Also all the next projects I open afterwards take the same time as usual.
If I reboot my computer the first project is opening slow again.

It is stuck in the first loading process (takes usually ~10 seconds), the second one where all the tracks are loaded is not affected.

Has anybody had the same behaviour already?