Joplin's FAQ page https://joplinapp.org/faq/ references a thread on slow initial sync that is clearly out-of-date. It would be helpful if the FAQ provided a link to some current solutions, or at least didn't point to the out-of-date solutions https://discourse.joplinapp.org/t/workaround-for-slow-initial-bulk-sync-after-evernote-import/746?u=laurent. The text in the FAQ that I'm referring to is:
Whenever importing a large number of notes, for example from Evernote, it may take a very long time for the first sync to complete. There are various techniques to speed this up (if you don't want to simply wait for the sync to complete), which are outlined in this post.