python upload big file example

Hi Paulo, the majority of the time taken by the files_upload_session_append call should be the time spent actually sending the file content to Dropbox over the network. I can't reproduce the issues you're seeing, so it does seem likely these issues are related to your network connection. 

Also, note that all of the Dropbox servers are located in the US. Your connection speed to Dropbox depends on the routing you get between your ISP and our servers, and may be slower than your ISP's rated speeds.

Sometimes resetting or retrying your connection gets you a different route and better speeds, but that is outside of our control. Some ISPs also throttle sustained connections so if you see an initial high connection speed followed by lower speeds, that could be the reason.

Finally, if you think there may be something interfering with your connection to the Dropbox API (e.g., a firewall, proxy, or other security software) you can try testing your ability to connect to content.dropboxapi.com.