I only able to observer the speed test at USA, not at anywhere else like thailand or singapore.
The DNS speed that you observe is based on your specific location. The results come from your interaction with the nearest Cloudflare data center in your region. Unfortunately, Cloudflare cannot guarantee you’ll be able to observe DNS speeds to other regions like Thailand or Singapore due to the network architecture specifics. It’s designed to give you the fastest connection possible from your own location, not a remote one.