I had a look at the Stack Exchange Servers:
Seems they only have two data centres with 11 servers. There’s no mention of CDN, which I presume is not possible since they are using server side html rendering (ASP.Net).
Yet, I feel like they are as fast as google (which has a gazillion servers).
How is this possible?
They do use CDN. It’s at the moment Fastly: https://www.fastly.com/network-map.