Fray Dends

Hi, love the product idea. Just wondering - with local notebooks (eg. encrypt/decrypt inbox) on the Mac desktop app, the sync icon spins for quite a while whenever a local notebook is changed (eg. delete a note from the decrypt_inbox). Is it definitely not sending something to the Evernote server? If not, why does the sync animation spin for so long? I don't have the technical knowledge to investigate this but I wonder if someone can shed light on why a local notebook even fires off a sync animation? It doesn't even seem to make sense to trigger a sync icon animation ever for local notebook operations?