You see the "Give feedback" button at the "Activity Monitor"? Report that with the screen shot of speed you get, as well as your Country/Region and ISP information.
If possible, also attach "tracert download.windowsupdate.com" output so Microsoft can see which part is lagging.
That's the only way Microsoft can know there is download speed problem in your region and see if they can find some way to fix it. (Say, if your PC is on GSM network and the bandwidth usage is already over the "fair use" limit, this kind of speed is completely normal, and Microsoft is not going to log that as problem)
Btw, for a record my PC in Hong Kong, the download speed is 26.2Mbps and 47.7Mbps.