速度
リソースヒント
重要な理由
Before a browser can download a file from another origin it must resolve DNS, connect and negotiate TLS. A preconnect hint starts that work early for origins you know you will need, such as a font or image CDN.
修正方法
- Add <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> for the one or two most important origins.
- Do not preconnect to many origins. Each unused connection wastes resources.
次のツールで確認
- Page Speed Test – Lighthouse performance score, lab metrics and real-user Core Web Vitals for any page.
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