Hello !
I’m sorry for the name of the post but it’s very important for a professional projet.
When I load my map with the “Load LevelStreaming” node in the 4.12.5 version, the Standalone export takes : 354.3 sec to load it ( Stat Levels) and works perfectly with the editor (less than 1 sec).
I give you my Logs :
Thank you very much for your help.