The load time for getting into the map preview while still inside the editor (e.g. not the load screen with the STO screenshot and the progress bar) seems unusually long these days. Maybe it is just because I am using the Badlands map with the appropriate Background in this case, but it seems excessive.
The UI doesn't react to any mouse clicks or similar actions during this time, which also tends to "alert" Windows that the program is not responding and it offers canceling the program.