This is an issue moved out of T6195, we have the problem that filling the keycache of Kleopatra takes too long. That causes users to use options like no-auto-check-trustdb to speed things up.
My opinion is that the solution for this is "use-keyboxd" and we should consider making this default in our distributions.
I am aware that I have opened issues like this years ago and our solution for this was use-keyboxd.
Here is what happens with my productive keyring on my normal System. Note that this takes longer then the complete startup / boot sequence on this system. It is not impending any functionality but I am very unhappy with the current state: