The website's server is located in Brazil, but I'm using Cloudflare anyway to try to make it work better in other parts of the world.

As for the nodes, I think they're usually located in North America or Europe. I'm from Argentina, and the fastest node shows a latency of 200 ms, which is enginerpc. I think 200–500 ms for a node isn't bad at all...

What tends to run very slowly for you?