Page Speed & Core Web Vitals Checker
Analyze Lighthouse scores and Core Web Vitals (LCP, CLS, TTFB) via Google PageSpeed Insights. Mobile and desktop scores side by side with improvement priorities.
๊ณต๊ฐ ๋๊ตฌ๋ MillionsCode ์๋ฒ API ํค๋ฅผ ์ฌ์ฉํ์ง ์์ต๋๋ค. ์ ๋ ฅํ ํค๋ ์๋ฒ์ ์ ์ฅํ์ง ์์ผ๋ฉฐ, ์ด ๋ธ๋ผ์ฐ์ ์์ Google PageSpeed Insights API๋ก ์ง์ ์ ์ก๋ฉ๋๋ค. ๊ณต์ฉ PC์์๋ ์ฌ์ฉ ํ ํค๋ฅผ ์ญ์ ํ์ธ์.
ํค ๋ฐ๊ธ: Google Cloud Console์์ PageSpeed Insights API๋ฅผ ํ์ฑํํ ๋ค API ํค๋ฅผ ์์ฑํ์ธ์. ๊ณผ๊ธยทํ ๋น๋์ ์ฌ์ฉ์ ๋ณธ์ธ Google ๊ณ์ ๊ธฐ์ค์ผ๋ก ์ ์ฉ๋ฉ๋๋ค.
์ฌ์ฉ ๋ฐฉ๋ฒ
- ๋ถ์ํ ์นํ์ด์ง URL ์ ๋ ฅ (https:// ์๋ ์ถ๊ฐ)
- ์ฌ์ฉ์ ๋ณธ์ธ์ Google PageSpeed API ํค ์ ๋ ฅ (์๋ฒ ์ ์ฅ ์์)
- Google PageSpeed Insights ๊ธฐ๋ฐ ์ฑ๋ฅ ์ ์ (0~100)
- ๋ชจ๋ฐ์ผ / ๋ฐ์คํฌํฑ ์ ์ ๋น๊ต ยท Core Web Vitals ์์ธ
- ์ ์ ๊ธฐ๋ฐ ๋ง์ถค ๊ฐ์ ์ ์ ์๋ ์์ฑ
- ์ต๊ทผ 3๊ฐ ์ธก์ ๊ฒฐ๊ณผ ์ ์ฅ (์ฌ์ธก์ ๋น ๋ฅธ ์คํ)
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Frequently Asked Questions
Q. What is PageSpeed Insights (PSI)?
Google's PageSpeed Insights tool measures Core Web Vitals โ LCP, INP, CLS, FCP, TTFB โ for both mobile and desktop. Scores above 90 are "Good"; 50โ89 are "Needs Improvement"; below 50 are "Poor".
Q. What are Core Web Vitals and how do they affect SEO?
Core Web Vitals (LCP, INP, CLS) are a set of real-world performance metrics that Google uses as a ranking factor since 2021. LCP measures loading speed, INP measures interactivity, and CLS measures visual stability.
Q. What is a good LCP score?
LCP (Largest Contentful Paint) should be 2.5 seconds or less for a "Good" rating. Above 4 seconds is "Poor." The most common culprit is a large hero image or font loading delay.
Q. What causes Cumulative Layout Shift (CLS)?
CLS (Cumulative Layout Shift) is caused by images without fixed dimensions, dynamically injected ads, and late-loading fonts that cause content to shift. Always specify width/height on img elements and reserve space for ads.
Q. How do I improve my PageSpeed score quickly?
Quick wins: (1) Convert images to WebP and lazy-load below-fold images; (2) Enable browser caching and CDN; (3) Remove render-blocking JavaScript; (4) Use next/image in Next.js for automatic optimization.
Q. Is mobile PageSpeed more important than desktop?
Yes. Google uses mobile-first indexing, so your mobile PageSpeed score directly impacts search rankings. Desktop scores matter for user experience but carry less SEO weight.
How to Use
Type the full URL of the page you want to analyze (e.g., https://millionscode.com).
Choose Mobile or Desktop analysis (or run both for a complete picture).
See your Performance, Accessibility, Best Practices, and SEO scores plus Core Web Vitals (LCP, INP, CLS).
Review the Opportunities section and prioritize fixes by estimated impact on load time.
Expert Knowledge: Page Speed & Core Web Vitals Checker
Core Web Vitals became official Google ranking factors in June 2021 with the Page Experience update. The three metrics โ LCP (Largest Contentful Paint), INP (Interaction to Next Paint, replacing FID since March 2024), and CLS (Cumulative Layout Shift) โ collectively measure loading, interactivity, and visual stability. Passing all three thresholds qualifies a page for the "Good page experience" signal.
The most impactful improvements for Korean blogs and e-commerce sites are typically image-related. Hero images and product photos are the primary LCP elements. Switching to WebP format, implementing lazy loading (loading="lazy"), and using responsive srcset attributes can cut LCP by 40โ60% on image-heavy pages. Cloudflare's image resizing feature automatically serves appropriately-sized images for each device.
For Next.js sites like those deployed on Cloudflare Pages, the built-in next/image component handles most image optimization automatically: WebP conversion, lazy loading, proper sizing, and preloading of critical above-fold images. The remaining CWV improvements typically involve reducing third-party script impact (tag managers, chat widgets), eliminating render-blocking CSS/JS, and optimizing web font loading with font-display: swap.
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