View this page in Chinese: https://support.ean.com/hc/zh-cn/articles/207243615（中文版页面）
Some pages of this site will experience the degradation when you visiting them through the internet of mainland China, especially for below listed pages and their child pages
Documentation pages: http://developer.ean.com/docs
Database pages: http://developer.ean.com/database
These pages require to load Google Fonts files and other Google embedded services, but most of Google services are blocked by China authority. This was the reason why the degradation happened.
ContentBlockHelper on Chrome, QQ Broswer and other chromium broswers
"Content Block Helper" is an Chrome extension works on most chromium browsers, it allows you to block sites which you don't want to visit. Since some Google services are not able to access with the network of mainland China, disabling the broswer to load these sites or domain will be the most effective way to improve your broswing experience.
Setting up process on QQ Broswer ( http://browser.qq.com )
1. Install ContentBlockHelper from App Center
2. Configure ContentBlockHelper on the options page: