I recently installed the last version of nVidia game ready drivers
It installed as well the new nVidia App replacing older GeForce experience App
After that, I had many issues starting the ESO client.
The start is at least very sluggish and longer than before
Sometimes the client is stuck for minutes with a black screen before to show the login screen, or fail to start
And even one time, the PC crashed and rebooted.
The issue is completely solved by opening the settings of nVidia app, and disabling overlay for nVidia app.
Many players reported loss of performance by 10% or 15% in other games due to this overlay.
nVidia seems to be aware of this issue.
Nevertheless, it shows again that both ESO launcher and ESO client are very sensitive to other processus running on the PC, and especially during the connexion to the server
(see the unable to load skin bug for the launcher).