On my 1Gbps line, I often get close to a 1Gbps on downloads from Europe. Interestingly the local CDN's seem to cap around 200MbpsI have a 100mb/s line and can't see the point in going to 200. So 10Gbit/s is madness. Also, I don't think you'll get high speeds from servers abroad. Maybe max 400mb/s?