Thank you for your response, but I'm a bit confused. Above, you mentioned that there is also slowness with Syncthing. However, at the same time, you say that Syncthing could be a fast solution.

Let me express my question more clearly. I am currently using Onedrive, and I have around 10,000 notes. If I were to format my computer or phone and reinstall Joplin from scratch, the synchronization of around 10,000 notes with Onedrive could take hours, maybe even days. If I were using Syncthing for synchronization, how would it be different for me?