Well it's 50mbps download / 5 or 6 (really don't know and can't test right now) mbps upload.
It's a ADSL or VDSL connection.
I don't think I have problems with the ISP, running speedtest almost always shows the max speed of the contract.
Might be something regarding odrive though - being an alternative client. I'm not sure but maybe dropbox and onedrive are throttling back the upload speed for clients they don't recognize (or for all users).
The comparison clearly shows constant upload speed for box.com and google drive and gaps in upload for onedrive and especially dropbox.
Running various google searches on this topic with different wording I finally found others noticing the same thing ("When Dropbox uploads files, it does not sustain a constant speed. The upload happens in bursts, stopping for a few seconds every few seconds. Other apps, such as CloudApp or Google Drive, or even ftp, upload consistently. This is a traffic graph of Dropbox uploading:":
http://webapps.stackexchange.com/que...load-in-bursts
and the reply from someone was that Dropbox uploads in
chunks of 4mb:
https://www.dropbox.com/developers-v1/core/docs