Cloudflare is among the largest cloud network platforms and their CDN solution combined with their DNS network is the fastest we have tested yet. Cloudflare has a free solution but it is the extra add-on Argo which gives extra speed. Their pro version gives extra security.
Based on our tests we noticed the importance of using Cloudlares nameservers for extra speed on DNS look-ups. Cloudflare has one of the fastest DNS look-ups we have ever tested.