Well, i have upgraded to the version Unity 2018.2.5f1 and some message appear now if we use a terrain on a scene and if we load it from asset bundle. Strip Engine Code ON *Edit : Also happen if Strip Engine Code is disabled Message from the console : ERROR: 0:89: 'bitfieldInsert' : no matching overloaded function found UnityLoader.js:4 ERROR: 0:90: 'bitfieldInsert' : no matching overloaded function found UnityLoader.js:4 Note: Creation of internal variant of shader 'Hidden/TerrainEngine/CameraFacingBillboardTree' failed. Before these messages, the game freeze during a few seconds. Everything is fine if the scene do not have a terrain. Link : https://www.asr-games.net/Testing/Terrain/ Thank you.