After installing and booting the 4.1.36-44.1-x86-64 kernel on my system, all GUI actions slowed down tremendously, including logging in, logging off, and rebooting. Going back to booting the 4.1.36-41.1-x86-64 kernel restores normal operating system speed. Has anyone else seen this happening on their system ?
I rebooted to OS 42.1 using the latest kernel and everything worked properly. Sorry for the noise !