Aliyun Hangzhou would have the best performance, according to Wugang on WeChat. It could also be helpful to have a node in Sichuan province or Inner Mongolia, where there are a lot of mining farms. Most of those farms use mining pools, though, and don't solo mine. I know Bitmain in particular has a mining pool in Sichuan that they've had some connectivity problems with, so maybe setting up a node in Chengdu would be helpful. If you do, make sure to let me know the IP address and I'll make sure it gets passed along to Kevin Pan.



Edit: I just noticed the contextual implication and wanted to edit to clarify. Hangzhou is probably not where BW.com is, but I think it's where another pool has its servers. That pool might want me to avoid naming them for security reasons, so I'm being a bit vague.