After discussing internally, we decided to pause this experiment as it can be solved by loading the file into a dummy scene and then serialize/deserialize into a new scene
No worries. Thanks for considering it! 
Always my friend 
When you say scene serialization and deserialization, do you mean .babylon files?
Can .babylon files help us avoid re-parsing Meshes, etc.?
Could you provide a PG?
The problem of rehydration of a serialized file is not the parsing but the generation of GPU data. whatever we do, this will be a price to pay.
That being said if you want to avoid the loading part, serializing/deserializating is the key:
Save Your Scene or Meshes | Babylon.js Documentation (babylonjs.com)
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