gencer received kudos from Aryeh Goretsky in ESET not compatible with Windows 10 ver 1903!
@Marcos, I had the same problem. Apps are getting opened slowly or some apps not even start. (Starts actually but no GUI shows up). I was almost report this until I see one of your reply on another thread.
You suggested that to enable pre-release updates. Which I did and everything fixed. Apps are now opening as fast as possible and that no-GUI apps are opening and no problem at all with 1903.