I find this very strange, as the major file synchronization client that I work on doesn&#x27;t have this problem. We use the fsevents API, and it&#x27;s pretty localized to the folders we monitor.<p>(I will admit that we have performance issues when users sync more than 100,000 files; but that&#x27;s more due to fundamental limits of what you can do in a user-mode application.)<p>Perhaps Dropbox is just trying to trap deleting &#x2F; moving &#x2F; renaming the Dropbox folder? That&#x27;s something that&#x27;s tricky to do; and we had to disable our technique to do it because it had too many side effects.