速度
资源提示
为何重要
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.
如何修复
- 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.
使用以下工具检查
- Page Speed Test – Lighthouse performance score, lab metrics and real-user Core Web Vitals for any page.
评分：通过的检查获得全部权重，警告获得一半，错误则不得分。 SEO 评分如何运作