Having a similar issue, and I filed FB15831006, "Prohibitively high energy usage from RealityKit when idling" as an API enhancement request.
nevyn
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For what platform are you developing? iOS? SpatialAudioComponent requires iOS 18 and/or macOS 15. That should be fine to develop on an x86 Mac. For visionOS, you can't use the visionOS simulator however, so that would require an Apple Silicon Mac.