No, the download client is not capped.
The download client is limited to 10 MB per second. You can easily download 20-25 MB/s on Steam and Origin without any issues.
They might be experiencing heavier traffic than normal, which could explain the delays.
Absolutely, I understand how to spark your interest!
Look at the settings cog in the upper right corner—you can tweak the speeds there
Only 800 kb/s available