The visit to Chinese Mainland is slow or even the connection times out

[pony495]

Chinese Mainland has a slow access, often times out of time, the game often loses connection, and has a very high packet loss rate, with a delay of about 300 milliseconds. However, the surrounding areas of Chinese Mainland, such as Japan, Russia and Taipei, will not have this problem (attached with test screenshots) (is this the problem of the Great Firewall in Chinese Mainland?) ：l