I need use SCNView snapshot API to do AR screenshot, before xcode 10, each time call snapshot, it response quickly. But since xcode 10 and ios 12, this API call take more than 0.5 second, it make our app very slow, can anyone help on this. Why the snapshot take 0.5 second since xcode 10? And whether apple developer will fix this issue. I this issue not handled, it will seriously affect our exist app. I'm waiting for your reply, many thanks!