How can I control shadow node initialization on the C++ side

[azimgd]

I'm trying to find a way to control the shadow node initialization phase manually. This would allow me to render components asynchronously using Fabric.

This example causes the app to hang for about ~6 seconds while nodes are created and measured, regardless if I prevent them from laying out on Obj-C side:

{Array.from({ length: 2000 }, (_, i) => (
  <View key={i}>
    <Text>{i}</Text>
  </View>
))}

What I want to do:

• Find a way to break up (or batch) nodes initialization without using private API's (e.g. Scheduler, MountingTransaction, UIManager)
• Do this without adding extra work to the JS or UI threads

Context: I'm exploring ways to create virtualization on the native side here: https://github.com/azimgd/shadowlist
So far, I've managed to get 60fps scrolling and lower memory use. But I'm having issues with a long fcp times.