Update! I (hesitantly) installed the Realtek High Definition audio codec driver 6.0.9257.1 from Dell Updates and it is still working great with the normal 15 second boot time. The bad update came from Windows update, not Dell. Not sure exactly what went wrong with the Windows update, but all is good now! [IMAGE]
I have installed dell critical updates then the system takes long time to restart New Dell XPS 9500 If I shutdown then boot again, fast start is present Do i have to do system restore using DellAssist app? OS:  Windows 10
XPS 15 9500, after updates, slow restart