Download files using dropbox chooser

There isn't a way to simply speed up these connections. 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.

It sounds like you're using the "direct" link type on the Dropbox Chooser. Alternatively, you may want to try the "preview" link type, in case that works better for your use case though. With the "preview" link type, the Chooser will return a link to a preview page for the chosen file, instead of a direct link, so you wouldn't download the file data directly. You could instead share the link to the preview page, e.g., if you need to let someone else download the file, or use the "Save to my Dropbox" functionality on the preview page to save the linked file to the signed in Dropbox account directly, instead of downloading it.

My requirement was to download the data(file) and store it in our internal server(VM by using wcf service). The average file sizes would be around 5GB process. Is there any other solution rather than chooser.

Another option is to use the Dropbox API to download the file, such as via /2/files/download. That would be more work to integrate than the Dropbox Chooser, and would not necessarily offer better performance.