Typically when using Muse and re-publishing, exporting or uploading Muse will determine the set of pages changed since the prior publish, export or upload and only generate the files related to those pages. Muse will then compare a “fingerprint” of the newly generated files to fingerprints for the files previously published/exported/uploaded to detect whether there were any differences and will only actually upload (or write out) the files that contain changes.
So Why Is Muse Regenerating And Uploading Everything?!
In short, after taking an update of Muse expect the next Publish, Export or Upload to be slow, but after that’s been completed and the .muse file has been saved, the next re-publish, export or upload will be back to normal, only generating files directly related to changes you’ve made.