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One of the thing that has always amazed me with Blender is the sheer speed at which it saves and loads large and complex scenes to/from disk.

I believe none of the other 3D packages is anywhere near that.

I'd love to hear how they do it if anyone knows (or has pointer to an explanation).

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I couldn't find very recent documentation, but the Blender wiki archive has a few articles that explain saving files. This article [1] in particular was an interesting read. It appears it is mostly a direct write of structs to disk.

[1] https://archive.blender.org/wiki/index.php/Dev:Source/Archit...

Somewhat related, check out Blender DNA. It works similar to Protobuf. I remember reading a pretty good article on it, can't find it now.

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