Although I have always believed that ping value is not the only criterion that represents speed, many friends still regard ping value as a god. Moreover, many friends recently asked me through online QQ: Is there a 50ms ping value in the United States? Why did XX give me a US-hosted website with only **ms, etc., etc., which gave me the urge to summarize previous articles. The content involved in this article is partly collected from the Internet. Since there are too many sources to list them all, I would like to express my thanks here.