Author here. I wrote this many years ago (2017?) while exploring techniques to create art that I could put up on my walls :-) If you enjoyed this article there are more similar ones linked on the main page: https://sighack.com/
Can I ask how you find the fastest links between countries and the servers for them? (Background: during my vacation last month I was playing an MMO from the APAC region but with servers in Germany, and it was crazy high latency. It made the experience quite bad. I wanted to rent my own servers and build a faster link for myself.)