I know that HN is not a help desk, but I have noticed DropboxOriginal eating a lot of my CPU (on OS X), when I am writing files to folders which are NOT under (

I know that HN is not a help desk, but I have noticed DropboxOriginal eating a lot of my CPU (on OS X), when I am writing files to folders which are NOT under (official) control of Dropbox (or at least: out Dropbox folder, not synchronized). Any ways to block this behavior on OS X? Security aside, it is really annoying for scripts which modify a lot of files.