Hello Supasteve,
Thanks for the question! The basic answer is it depends on the location of the data center of your server. This is denoted in the server name. You can find your server name and then look to see if it has "ec" in the beginning of the server name. If it does, then it means you're on the EAST COAST data center. If not, then you're on the West Coast data center. Here's the general information page for the Max Speed Zones.
I hope this helps to answer your question! Please let us know if you have any further questions or concerns.
Regards,
Arnel C.