速度
サーバー応答時間
重要な理由
Server response time (time to first byte) is the wait before anything can load. A slow server delays every metric, including Largest Contentful Paint.
修正方法
- Enable page caching and a CDN.
- Upgrade slow hosting or optimise database queries.
- Aim for a response under about 600 ms.
次のツールで確認
- Server Response Time (TTFB) Test – Measure DNS, connection, TLS and time to first byte over three requests.
- Page Speed Test – Lighthouse performance score, lab metrics and real-user Core Web Vitals for any page.
スコア：合格したチェックは満点、警告は半分、エラーは 0 点になります。 SEO スコアの仕組み