Ask HN: How can I improve my Chinese users' experience?

I've implemented an enterprise webapp using Salesforce and it's been great (business metrics wise), but the experience completely breaks down in China.

The great firewall really hinders the performance of the website. Page loads are super long, connections sometimes reset, google captcha is outright blocked, some emails don't reach their recipient.

On the UI end, it seems that the UI queues that work very well for westerners sometimes outright confuse Chinese users.

Does anyone have any tips I could use to improve this situation? I can't feasibly reimplement the app on another platform, but I can't recommend using a VPN either.