I just ran some tests and it might also be that the physical distance between the MySQL server and the web server is to large or the network might be overloaded. I don’t know, but a “smart” host would have two networks, one for internal datacenter traffic (backup/MySQL) and one for outbound traffic (web). Maybe DH just has one network card in the servers which handles all the traffic. This would explain why the MySQL servers are so slow, without having a lot of queries.
In my tests a placed the webserver and mysql server around 300 miles apart with traffic running over one network interface and even though the servers are both fast themselves, suddenly the speed is dramaticly decreased if I have that large physical distance.
So DH might have the database servers in one datacenter and the webservers in another.
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