On my Windows machine looking at the task manager PI never takes more then 5 seconds to exit completely. Now I do have PI the executable and all PI associated folders including swap folders excluded from my virus protection. Maybe that is why I have no delay.
Just opening PI from icon and not a project from push of button to completely open 65 secs. Closing empty project 55 secs and actually closing a large project took 65 secs.
i sampled the process and whatever it's doing seems to be settings related, looks like the destructor for QSettings is what's taking so long.