LOw track changes + master/slace document

I’m writing a story, but it’s about to become large and my system is quite underpowered. This means that I’d like to cut it up using a master/slave document structure, as an editor (the job, not the program) might attach loads of comments and suggest changes using the track changes feature which would bring my system to its knees when all of it would be in one document.

Now, are the changes (for track changes) and comments on the documents stored in the slave documents or do they affect, somehow, the master document or other slaves of the master document?