The 21YunBox Blog

We’ve written numerous posts to assist foreign companies in achieving success in China. Our goal is to provide valuable insights and strategies that can help businesses navigate the unique challenges and opportunities in the Chinese market. Stay tuned for more updates and feel free to reach out if you have any questions or need further assistance. We’re here to help!

280 Sites Measured From Inside China: A Third Never Finished Loading

We requested 280 enterprise sites from a probe inside mainland China, three times each. 58% finished every attempt and 34% finished none — and two thirds of the failures answered first. Blocked is not the common failure.

Aug 29, 2026

A Chinese Cloud Probe Is Not a Chinese Visitor: The Same Hosts, Opposite Answers

We measured third-party hosts from a mainland cloud probe, then from a Beijing consumer broadband line. Hosts that answered 100% of the time from the cloud answered 0% of the time from the home line — which means most China measurements, including ours, are taken from the wrong place.

Aug 28, 2026

ICP Filing vs ICP License: What the Regulation Actually Says

The filing/licence distinction that governs every foreign website in China comes from one State Council decree. Here are the operative articles, in the original and in translation, with what each one means in practice.

Aug 28, 2026

Four Ways to Deliver a Website Into China, Measured — Three of Them Never Finished Loading

We served one identical page four ways and measured it from inside mainland China. Offshore, nearshore, and in-country ICP-filed hosting all failed to finish loading in 60 seconds, every attempt. The fastest first byte belonged to a path that never completed.

Aug 28, 2026

Eight Ways We Got China Performance Measurement Wrong — and Why Seven of Them Flattered Us

Every one of these is a real error we made building a probe network inside mainland China. Each produced a number that looked publishable. Seven made our own product look better than it is.

Aug 28, 2026

An ICP Filing Will Not Make Your Site Fast in China — and the Fast Path Still Needs One

Compliance does not buy performance. That is true, and it is only half of the relationship. The path that removes the cross-border round trip is the same path that triggers the filing requirement — which is why the two decisions cannot be made separately.

Aug 27, 2026

China CDN Providers Compared: Who Has Mainland Nodes, and Who Needs Your ICP

Which CDNs actually have points of presence inside mainland China, which serve China from Hong Kong or Singapore, and which require you to hold an ICP filing yourself. A provider-by-provider comparison.

Aug 27, 2026

Case Study: Enterprise DXP in China (Sitecore & Vercel)

How a global enterprise kept Sitecore XM Cloud and Vercel while making its China website fast, secure, and compliant using the 21YunBox Optimizer.

May 6, 2026

China Website Optimizer: Boost Enterprise Performance, Security & Compliance

21YunBox helps global enterprises make their existing websites work reliably in Mainland China. Maximize speed, security, and visibility with our enterprise-grade Optimizer overlay.

May 4, 2026

Hosting and CDN for China: What Actually Works, and What the Filing Requires

A CDN only helps if its points of presence are inside mainland China — and anything served from inside mainland China needs an ICP filing. The hosting and delivery options, compared on both.

May 11, 2025

Top App Stores in China: Your Ultimate Guide

Discover China's complete app store ecosystem. Learn about 20 key platforms including Huawei App Gallery, Xiaomi Store, Honor Market, and niche players like Zhuoyi and HiAPK. Essential reading for app developers targeting China.

Mar 2, 2025

China ICP License and ICP Filing: What It Is and How to Get One

An ICP filing is required for any site served from mainland China, it is issued to a mainland legal entity, and it binds to your hosting provider. What it costs, how long it takes, and what gets applications rejected.

Jul 21, 2024

China AI Algorithm Filing: Who Actually Needs One, and What the Rules Say

Algorithm filing is not required of everyone deploying AI in China — the trigger is a specific phrase in the regulation. The operative articles, in the original and in translation, with the ten-working-day clock and what happens to offshore services that skip it.

Jun 24, 2024