Thread:VisualEditor/Feedback/3 comments/reply (8)

Reading the 80kb of (static) parsed code is different from having a script to interact with that same amount of code.

And for the purpose of editing a section, the VE could just keep the other sections intact, to provide you some context, but still parse/interact only with that only section (and in case you change your mind and also want to edit more section after that, it could edit the whole page - or a group of sections, if that was possible).