I think 23 seconds is not bad. What kind of storage you are using? What is the load on the hosts hosting these desktops? Can you use some profile Mgt tool like - Persona Mgt, RES or Liquidware Profile unity?
I am working on a POC and trying to bring down the time from 38 secs to 12-15 secs Image may be NSFW.
Clik here to view.
Not sure, if I will succeed. Remember there are Group Policy that still gets applied.
