Out of interest, what speed do you get uploading from work computer to Dropbox? If your work computer hasn't finished indexing the folder, this would explain the slow speed. It might be a misconfigured firewall/router problem on either end. Check to see whether the listening port (random port, listed in Bittorrent Sync preferences) is open. To open this port, try enabling "UPnP port mapping" on both ends (though it should already be enabled), if the network/router supports UPnP this will do the job; otherwise, you'll need to open the ports using the router interface (just UDP, not TCP). You might need to ask your work sysadmin to open these ports for you. Also, make sure software firewalls on your work & home computers aren't interfering with Bittorrent Sync (you might have to whitelist the activity of this application if the firewall allows you to do so, for example). If these don't solve it, check CPU usage of running processes. You might spot an antivirus trying to scan everything being downloaded to home computer, or a struggling filesystem process. What are the OSes on your work and home computers?
