How much data does SimCity transfer?

I did a little bit of monitoring using Windows 7’s built in Resource Monitor (not the best monitoring tool around), and here are my observations:

• When the game itself is just loading, the send and receive speeds hover around 5‒8 KB/s.
• The largest bandwidth load was on actually loading the map with receive speeds hitting upwards of 130 KB/s, and send speeds just below that.
• During normal playing the game (small city with ~1500 residents) the speeds stayed low, around 0.15‒0.3 KB/s or even as low as in the screenshot below.
• Every so often the network load spikes (as seen on the “Network” graph), when, I suppose, it synchronizes with surrounding cities (which reportedly happens every three minutes or so), but that spike isn’t so bad.
• Importantly, when the heavy network activity goes on, my antivirus (Kaspersky) uses almost as much bandwidth as the game itself (I don’t know if most AV software works like this).
• In general, aside from the occasional spike, the graph does not even register the game’s bandwidth in comparison to the rest of the load.
• I reset my network connection prior to this test, and the results of the first 25 minutes can be seen in the screenshot (7 MB downloaded, 2 MB uploaded). This is not exact figure, as I also have Facebook and SE open in browser with usual AJAX trickery going on, and various background processes. This is where more advanced monitoring tool could be helpful, where I could track the impact of only that particular process.
• The screenshot was taken 25 minutes after I reset the connection, but an hour in numbers were different: only 1 MB was added to my received count, but sent count shoot up to 7.5 MB, possibly because I got disconnected from the SimCity server (again), and the game tried to connect or synchronize the city on exit.

All in all, not precise science, but should give some idea of the impact.

After the offline update in March of 2014 it is possible to play Simcity 2013 in offline mode. When the game is played in this state the online features of the game such as inter-city trading or playing with friends will be unavailable. If you're installing the game for the first time or haven't played Simcity between it's 2013 release date and 2014 offline update you may be prompted to update the game so it has the capacity to be played offline. Ironic, right?

Ultimately, the game will not transfer any data when played offline.