Also, the order of images and other non-spine resources is not relevant. And here is no order inside the zip archive that comprises the epub. The only order important in BookBrowser is the xhtml files order which represents the spine.
As theducks, explained, most file systems use alphanumeric sorting when presenting unordered sets of files. This is exactly what Sigil's BookBrowser does as well.
If saving an epub is "slow" my guess is your anti-virus protection or auto back-up software is interfering somehow. Or you are using a slower network addressable storage (or are trying to write files back into calibre?)
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