"Bookmarks are being synced..." message in Safari
Your iPad or any iOS/macOS device logged into an iCloud with Safari sharing in Settings -&gt; iCloud -&gt; Safari will sync history, bookmarks, and logins. Any changes to the bookmarks will trigger the sync, forcing you to wait. Its a pain in the arse to manage bookmarks with this always popping up.

Disable the syncing in your iCloud settings under Safari.