For most authors, Adobe DE's requirement (for the Sony and, eventually, other handheld devices) of < 300 KB per ePub XML file is easily met by using one file per chapter. Feedbooks has been using this approach for some time now. However, Proust is one of the authors where this isn't sufficient. In the case of Swann's Way, for example, Part 3 is 508 KB.
The only solution I am aware of is to arbitrarily split large files into smaller files. This matters because DE always adds a page break at the end of each file.
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