SSD-0012 · Status: stable · Version 1.0 · Reviewed 12 November 2026 · Wikidata Q104618838
Definition
Core Web Vitals are a set of field metrics Google uses to summarise real users’ experience of a page: loading speed, interaction responsiveness and visual stability.
核心網頁指標是 Google 用來概括真實使用者體驗的一組實測指標：載入速度、互動反應與視覺穩定性。
In practice
Three metrics: LCP (largest contentful paint, loading), INP (interaction to next paint, responsiveness, which replaced FID in 2024) and CLS (cumulative layout shift, visual stability). They are measured from real sessions at the 75th percentile, not from a lab test — which is why a good Lighthouse score and a failing field report can both be true. As a ranking input the effect is real but small: roughly a tiebreaker between pages of similar relevance. The larger value is commercial. Slow pages lose conversions whether or not they lose positions.
三項指標：LCP（最大內容繪製，載入）、INP（互動到下次繪製，反應性，2024 年取代 FID）、CLS（累積版面位移，視覺穩定性）。它們取自真實工作階段的第 75 百分位，而不是實驗室測試——所以「Lighthouse 分數好」與「實測報告不合格」可以同時成立。作為排名因素，效果真實但很小：大致上是相關性相近頁面之間的決勝分。更大的價值在商業層面：慢頁面會流失轉換，無論有無失去排名。
What it is not
- Not a single score. The three metrics fail independently and need separate fixes.
- Not lab data. Lab tools diagnose causes; field data decides whether you pass.
- Not the whole of page experience. It is one input among many, and a small one.
Status
Stable, but versioned. The set has changed once already (FID to INP in 2024) and can change again. Any Core Web Vitals figure quoted without a date and a metric name should be treated as unreliable.
Identity
- Wikidata: Q104618838 — Core Web Vitals
- English aliases: CWV; web vitals; page experience signals
- 中文正名：核心網頁指標（香港、台灣）；中國大陸作「核心网页指标」
- Primary official source: web.dev: Web Vitals
Related terms
Sources
- web.dev, “Web Vitals”, web.dev/articles/vitals (accessed 12 November 2026).
- Wikidata, item Q104618838 “Core Web Vitals” (accessed 12 November 2026).