Bug#950174: 950174 resolved!

[G.M.]

HI
after much research and knowing that the problem does not arise on new
installations,
I searched for all the old configuration files
In the X11 folder /etc/X11/Xsession.d/ there were files from 2010 and
trying to associate each file with the package they were installed from..
 I found the file
/etc/X11/Xsession.d/20desktop-profiles_activateDesktopProfiles
belonging to the package
desktop-profiles

I fixed it by deleting the outdated package desktop-profiles and finally it
works without errors and without slowdowns!
I hope it's useful for those who have old debian installations ;-) and who
wisely keep upgrading

bye bye Gianluca
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