I have to wait on my macs (27" and two 13" Macbook, three and four years old, newest systems) almost 10 to 15 Minutes until i can use other apps, as dropbox syncs so slow the list. After list is loaded, the file syncing is in normal speed.
An update to the next level (where Smartsync is possible) is too expensive.
So what to do?
Best regards
Josef