Just tested the performance using today's Xcode 13.0 and iOS 15.0 beta 1 builds and there is still NO improvement. The shader compiles still occur on the DisplayLink event, freezing the whole UI for long periods of time (300-400 msec per model).
There are also only minor changes to SceneKit APIs in iOS 15 / macOS 12 for Swift async, but there are significant changes and enhancements to RealityKit APIs. It sure looks like SceneKit has been abandoned.
lenk
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