21YunBox はサイトの何を変えるかをどう決めるのか
判断はリソースごとに行われ、経験則ではなく中国の内側で取った計測に基づいて行われます。これが重要なのは、素朴なやり方——すべてを中国配信レイヤーに通す——が、かえって悪化させるものがあるからです。実測事実:中国本土内のプローブから12時間にわたり10分ごとにサンプリングしたところ、よく使われる5つの第三者リソースのうち2つは、追加のホップを経るより 直接要求した方が速く、それぞれおよそ170〜200ミリ秒の差でした。それらはそのままにすべきであり、あらゆる参照を既定で書き換えるレイヤーは、それらすべてでこのペナルティを払います。一方、本当に変える必要のあるリソースは、速度チューニングでは届かないかたちで失敗します。中国本土内から計測した280のエンタープライズサイトを横断して、34% は3回の試行をいずれも完了せず、そのうちおよそ3分の2はすでに応答し描画してから停止していました。つまり、ある特定のリクエストについての有用な問いは「遅いか」ではなく「訪問者が実際にいる場所から、完了するか」であり、それに答えるには両方の経路を計測しておく必要があります。国境越えをなくす配信の構成は、同時に ICP備案を伴うものでもあり、だからこそ2つは順番にではなく一緒に計画されます。
判断の根拠となる計測
| 事実 | 一次情報源 |
|---|---|
| よく使われる5つの第三者リソースを、中国本土内のプローブから12時間にわたり10分ごとにサンプリングしたところ、5つのうち2つは直接要求した方が速く——追加のホップを経るとおよそ300msに対し、直接ではおよそ110msでした。すでに健全なホストを配信レイヤーに通すのは、何の得もなくレイテンシを払うことであり、だからこそ判断はリソースごとに行う必要があります。 | 21YunBox — twelve hours of third-party sampling from inside mainland China |
| 中国本土内のプローブからそれぞれ3回要求した280のエンタープライズサイトを横断して、58% はすべての試行を完了し、34% はいずれも完了しませんでした——そして失敗のおよそ3分の2は、停止する前に最初のバイトを返しコンテンツを描画していました。よくある失敗は、遅さでもブロックでもなく、非完了です。 | 21YunBox — 280-site China delivery census, measured from inside mainland China |
| 失敗するのはたいていサイトではなく依存です。北京の China Mobile 家庭用ブロードバンド回線から88回の実ページ読み込みを横断して計測したところ、102 のホストが一度も応答を返さず、そのうち101が第三者でした。一方、読み込みを完了できなかった57サイトはいずれも、自身は最初のバイトを返していました。 | 21YunBox — paired measurement from a Beijing residential broadband line |
| 計測を取る視点が答えを変えます。対になった計測では、本土のクラウドプローブから 100% 応答したホストが、北京の消費者向けブロードバンド回線からは 0% しか応答しませんでした——つまりクラウドプローブのデータで下した判断は、実際の訪問者には誤りになり得ます。 | 21YunBox — paired measurement from a Beijing residential broadband line |
情報源は 21YunBox China エンジニアリングチームが2026年8月30日に確認しました。
21YunBox の使い方
21YunBox を使うためのハウツーガイド。以下のテクノロジーを中国で動くようにします。
21YunBox のよくある用途について、数十本のガイドを書いてきました(ガイドは英語です)。
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