These new attempts, but still don't work, may be because there is a conflict between the audio capture and audio playback of ARWorldTrackingConfiguration, which may need to be modified similar to these: let audioSession = AVAudioSession.sharedInstance() try？ audioSession.setCategory(.playAndRecord, mode: .default, options: [.allowBluetooth, .mixWithOthers, .defaultToSpeaker]) try？ audioSession.setActive(true, options: .notifyOthersOnDeactivation) Is there any way to modify it in RealityKit?

The problem started with 15.4.1, which did not exist before 15.4, and fell from 60FPS to below 30FPS when several entities were placed in the scene. (appears about 1 minute later). There will be stutters in ARView when adding larger entities, how to improve fluency? Stutters also exist when you set the ModelEntity.modelDebugOptions property in a complex entity.