It's nothing to do with how I feel. If your WiFi only supports 10Mbps as you mentioned it is slow by modern standards. It is unclear how you measured that figure, so it is probably only your outbound internet connection that operates at that rate, the local network may well be faster, especially if the access point is configured correctly & was made in the last 5 or so years. If you have no other way to get online then all you can do is wait.
iTunes is far faster to backup over USB for many Gigabytes of data. A Mac or PC will finish a backup in minutes not hours. If you have a cellular data plan that may also be faster for iCloud backups if you have 4G (LTE can run up around 150 - 300Mbps), however it can eat up most data plans if you are not on a truly unlimited plan. It also depends on what rate the carrier limits you to.
Winston Churchill, at that rate a 27GB transfer would take 2.5 days.
http://www.wolframalpha.com/input/?i=27GB+at+1Mbps
That seems a long time to leave an iOS device connected to power & locked. iCloud backups require those two conditions for automatic backups.
What am I missing, the units look correct to me?