about system does not work

[leszek]

That looks really ok to me and really fast. So the issue must be in sddm or plasma starting itself.
Can you take a look if there are any errors in /var/log/sddm.log

So execute for example

Code:

cat /var/log/sddm.log

to get an output. If nothing is displayes it might be empty which then means it really is a plasma startup problem.

In that case can you try creating a new user and see if it's login times are faster?