My hand crashes when I add a meta human in the scene

I am making a game and I need characters and NPC’s and I prefer the metahuman over ones like character creator (mainly because of the shoulder issue) but when I add a metahuman character to the scene, the frame rate drop a lot when he is on the screen then when I package the game with the meta human in the scene, the build is successful but the game won’t launch, it crashes on startup… However when I remove the meta human and rebuild, the game works just fine… Any idea?