Having an oversea sites can run into all sorts of networking issues if you are accessing these websites in China. This is because of the well known firewall of China. You will need alternative solution if you have users in China that use websites outside of China. If no, you will be running into countless uncontrollable risks.
Time to Locate a Mirror in China
Unlike other countries, it is favorable to have a mirror sites in China. You can consider this option if you have a large user base in China. Although there are conditions to setup a website, the returns will outweigh the risks of blocks from China firewall. The mirror site can also serve as your redundancy or CDN (Content Delivery Network) for high availability and added performance.
If you do not meet the conditions for a mirror site in China, there are other options for you to consider. You can transmit your data real time via your VPN instead of the regular internet. Using VPN have its advantages with faster latency. However, there are also risks because they will be subjected to firewall blocks and it will also cost more. You may also consider store and forward method where you accumulate your data for transmission. Although you may not have real time data, you can manage your user expectations and controlled your data transmission at a lower cost and systematic manner.
Having users in China is a tricky approach for your website. If you have a large user base in China, it is worthwhile to invest a mirror site within China. Otherwise, you may consider lowering user expectations and opt for non real-time or less availability solutions.