What about Asia-Pacific? We have a service in AU which currently we're serving from our US-East servers, and I just assumed we would want to move to AP when we could, but is it not better than US-West?
That's what I assumed myself initially, so I spun up an AWS micro instance in their Singapore data center. But then I found that the ping times were almost twice that for instances in the US west coast, because some Australia ISPs (including mine which is Optus) route traffic to Singapore or Japan via the US west coast since it's cheaper than going through Perth. So although Singapore is closer to Australia than the US as the crow flies, it's not necessarily closer on the internet.
If you're lucky enough to have customers on specific ISPs, Singapore can be great. We have users who are predominantly on AARNet, Internode and other ISPs with decent transit (e.g. SEA-ME-WE 3) and the latency between AU and SG via Perth is wonderful.
