I have been using Spotify for many years now, but what is weird is that it keeps using upload and maxing out my upload on my connection even if Spotify is not streaming.
Monday to Friday I work as a system administrator for a large corporation and likes listening to music when I do my chores, but I noticed spikes in upload bandwidth when using Spotify; Why did it upload loadfull of data when it's primary function was to stream DOWN music. It is not P2P after all.
To test this I went home, cleared most of my services which requires an Internet Connection and launched Spotify. I made sure all the options which could "call home" in preferences were turned off, like Facebook and publishing top artist and tracks.
Then I tested to see if anything on my computer used bandwidth without Spotify running and there were minimum data in/out:
Just a few keep alive pings were done, here are a few screens which shows a graph of upload / download. Tested it for about 5 minutes and in that time, not a single spike of upload more than 5KB/sec was made: Here are some screens, note that each length of the graph is estimated 2 minutes:
As you can see, no usage of bandwidth. Now it is time to Launch spotify and check resmon for activity + check network traffic to monitor the hidden traffic usage by Spotify:
Launched Spotiy As you can see, Spotify has now launched, there was a small spike in download, which was to be expected, note that the song is on pause (resumed from last state I guess).
Waiting As you now see, Spotify is not using any Download or Upload, which is the way it should be since it is paused.
First spike just four minutes in, you see a "small" spike in upload usage, but this is only about 1/4 of what my home connection can survive, since I use a 20/2 ADSL connection. Quickly ran a Netstat to see if any hidden services would chunk bandwidth; No there wasnt.
Second spike just around 45 seconds after the first one. Now this spike dips into my max speed 300KB/s, which is basically killing my entire Internet connection.
It continues to spike like that ever minute or two after that, which is pretty bad for my Internet experience; Especially so since I game and when it maxes out my output bandwidth I go from 20ms ping to about 600+, and makes it unplayable.
Just to be sure it was Spotify, I turned it to offline mode while it started to spike, and the upload was killed instantly.