Have you tried Speedtest.net? If that shows your download speed at just over 2Mbps then that will be your correct download speed. I find the tester fairly accurate.
I don't know about Opera's speed indicator or how accurate it is.
Surface Pro (2017) vs Surface Pro 4
Where HTML5 is headed next
MacBook Pro v Surface Pro 5
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.