核心網頁生命指標（Core Web Vitals）是 Google 為提升網頁使用體驗所推出的一套效能評估指標。這些指標聚焦於網站的實際載入速度、互動反應與視覺穩定性，是網站品質與 SEO 評價的重要依據。
目前的核心指標包含三項：最大內容繪製（Largest Contentful Paint, LCP）、首次輸入延遲（First Input Delay, FID）以及累積版面位移（Cumulative Layout Shift, CLS）。
LCP 衡量頁面上最大可見內容元素的載入時間，是評估網頁初次顯示速度的關鍵。建議值為 2.5 秒內，超過此數值可能讓使用者覺得網頁「很慢」。FID 測量使用者首次與頁面互動（例如點擊連結或按鈕）到瀏覽器實際回應的延遲時間。該數值應低於 100 毫秒，以確保使用者能夠流暢操作。CLS 則觀察網頁元素是否會在載入過程中出現跳動情況，造成誤點或不便，理想的 CLS 分數應低於 0.1。
這三項指標不僅與使用者體驗密切相關，更被納入 Google 的搜尋排名因素之一。換句話說，一個效能不佳的網站，即使內容優質，也可能在搜尋結果中被降權。
網站開發者可以透過工具如 PageSpeed Insights、Lighthouse 或 Search Console 來分析與改善這些指標。常見的優化策略包括使用延遲加載圖片、壓縮 CSS/JS 檔案、提升伺服器回應速度與預留版面空間等。
隨著網頁使用者對速度與穩定性的期待提升，了解並優化 Core Web Vitals 已成為網站成功不可或缺的一環。
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