-link">WebPageTest</a></h3>

      <p>
        <a hreflang="en" href="https://www.webpagetest.org/">WebPageTest</a> is a prominent web performance testing tool and the backbone of HTTP Archive. We use a <a hreflang="en" href="https://docs.webpagetest.org/private-instances/">private instance</a> of WebPageTest with private test agents, which are the actual browsers that test each web page. Desktop and mobile websites are tested under different configurations:
      </p>
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