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https://hanzama.x0.to/2020/05/30/the-speed-test-site-which-allows-you-to-measure-the-speed-and-delay-of-the-net-is-available-at-cloudflare-gigazine/
ネットの速度や遅延をサクッと&詳細に計測できるスピードテストサイトがCloudflareから登場(GIGAZINE)