This seems to be a known issue with dconf as it can be read in the dconf 
manual. 
https://developer.gnome.org/dconf/unstable/dconf-overview.html
"The binary database format that dconf uses by default is not suitable for use 
on NFS, where mmap does not work well."

This seems to be also applicable to cifs.

The solution is better explained in the Red Hat Customer Portal 
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Desktop_Migration_and_Administration_Guide/store-user-settings-over-nfs.html

Short version:
1. Create file /etc/dconf/profile/user
2. There insert following line:
service-db:keyfile/user
3. Save the file and reboot

Question is whether this could be the default.

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https://bugs.launchpad.net/bugs/1364316

Title:
  Very slow/failed logon on cifs mounted home caused by locking issues
  of .config/dconf

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