SEOCore Web Vitals (CWV) là 3 metrics đo trải nghiệm người dùng, là ranking signal của Google từ 2021. INP thay thế FID từ tháng 3/2024.
LCP (Largest Contentful Paint): thời gian render phần tử lớn nhất (hero image, heading) — target: <2.5s. Cải thiện: optimize images (WebP, lazy load), preload fonts, SSR/SSG.
INP (Interaction to Next Paint): thời gian phản hồi khi user interact (click, tap) — target: <200ms. Cải thiện: code split, defer heavy JS, reduce main thread work.
CLS (Cumulative Layout Shift): mức độ layout bị 'nhảy' — target: <0.1. Cải thiện: set width/height cho images/videos, font-display swap, avoid dynamic content injection above fold.
Google Search Console báo CWV cho từng URL. Trang có CWV tốt được ưu tiên ranking khi 2 trang có relevance tương đương.
Core Web Vitals (CWV) are three metrics measuring real user experience and have been a Google ranking signal since 2021. INP replaced FID in March 2024.
LCP (Largest Contentful Paint): measures how long it takes to render the largest element (hero image, heading) — target: <2.5s. Improve by: optimizing images (WebP, lazy load), preloading fonts, using SSR/SSG.
INP (Interaction to Next Paint): measures responsiveness to user interactions (clicks, taps) — target: <200ms. Improve by: code splitting, deferring heavy JS, reducing main thread work.
CLS (Cumulative Layout Shift): measures unexpected layout shifts — target: <0.1. Improve by: setting explicit width/height on images/videos, using font-display swap, and avoiding injecting dynamic content above the fold.
Google Search Console reports CWV scores per URL. Pages with strong CWV scores gain a ranking advantage when competing pages have similar relevance.