Websites not hosted in China can be blocked entirely or experience
exceptionally slow page load times. This is because of various information
protection policies adopted by the Central Government.
For instance, most people know that Facebook, Twitter, Youtube and Google
are blocked in China, but did you know that your website can also be blocked
if it uses any publishing products of Facebook et al.
Your site may also be blocked simply because of where it is hosted. If your
site is not hosted in China and it is not blocked by the firewall, it can
(and is common with 95% of sites) experience exceptionally slow load times
that local ISPs will cease download requests of your site.
To reach Chinese buyers, you need to ensure that your site, or the site you
advertise on, is hosted in China.