Analyze page load speed and Core Web Vitals
* Demo mode — simulated results. For real data, use Google PageSpeed Insights API.
Analyze your website's page load speed and Core Web Vitals with our free online tool. Get a Performance Score (0-100), First Contentful Paint (FCP), Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), First Input Delay (FID), Time to First Byte (TTFB), and Speed Index. View actionable optimization opportunities with estimated time savings. Essential for SEO and web performance improvement.
Page speed is a confirmed Google ranking factor and directly impacts business metrics. According to Google research, 53% of mobile users abandon a page if load time exceeds 3 seconds. Core Web Vitals became an official ranking signal in 2021, affecting both desktop and mobile rankings. Slow pages increase bounce rate, reduce time on site, lower conversion rates, and negatively impact brand perception. Improving page speed is one of the highest-ROI SEO investments you can make.
LCP (Largest Contentful Paint): Good < 2.5s, Needs Improvement 2.5-4s, Poor > 4s. FID (First Input Delay): Good < 100ms, Needs Improvement 100-300ms, Poor > 300ms. CLS (Cumulative Layout Shift): Good < 0.1, Needs Improvement 0.1-0.25, Poor > 0.25. TTFB (Time to First Byte): Good < 800ms. FCP (First Contentful Paint): Good < 1.8s. Aim for 'Good' on all metrics for the best SEO and user experience.
Page Speed Analyzer is useful when you need to complete a focused task quickly without installing desktop software, creating another account, or switching into a heavy workflow. It works well for quick checks, conversions, previews, cleanups, generation tasks, and everyday operations where speed and consistency matter. Analyze your website's page load speed and Core Web Vitals with our free online tool. Get a Performance Score (0-100), First Contentful Paint (FCP), Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), First Input Delay (FID), Time to First Byte (TTFB), and Speed Index. View actionable optimization opportunities with estimated time savings. Essential for SEO and web performance improvement.
Start with a small sample so you understand how Page Speed Analyzer handles your input, then apply it to the full task. Review the important fields, copy or export the result, and test it in the place where you plan to use it. This keeps the tool fast while still giving you a practical quality-control step before production use.
Before using the output, check formatting, special characters, line breaks, file names, URLs, units, numbers, and mobile display when relevant. If the result affects SEO, code, design, business documents, analytics, or customer-facing material, compare it against your original requirement and fix any context-specific detail before publishing.
Manual work is fine for one-off tasks, but repeated manual formatting or checking is slow and easy to make inconsistent. Page Speed Analyzer helps standardize the process, reduce copy-paste mistakes, and produce a cleaner starting point so you can spend more time on review, judgment, and improvement.
According to Google Lighthouse: 90-100 is Good (green), 50-89 is Needs Improvement (yellow), 0-49 is Poor (red). Aim for 90+ on both mobile and desktop.
This tool runs in demo mode with simulated data. For accurate real-world results, use Google PageSpeed Insights at pagespeed.web.dev.
Core Web Vitals are an official Google ranking signal since June 2021. Pages with good Core Web Vitals are prioritized in rankings, especially when other factors are equal.
LCP (Largest Contentful Paint) measures how long it takes for the largest visible element to load. A good LCP is under 2.5 seconds. Between 2.5s and 4s needs improvement. Over 4s is poor.
Key improvements include: serving images in WebP format, removing render-blocking scripts, enabling text compression (gzip/brotli), using a CDN, reducing unused JavaScript and CSS, and optimizing server response time (TTFB).
Yes. Page Speed Analyzer is designed as a free browser-based utility for quick personal, learning, and professional workflows.
No. You can use Page Speed Analyzer directly in a modern browser such as Chrome, Edge, Safari, or Firefox.
Yes. The page is responsive and can be used on phones and tablets, although desktop is usually more comfortable for long input or repeated copy operations.
Use clean input, test with a small sample first, review the output carefully, and adjust any details that depend on your final use case.
In most cases, yes. You can use the generated or processed output in personal and commercial projects, but legal, financial, medical, or security-sensitive work should still be reviewed by a qualified person.
The tool is built for quick browser workflows. You should still avoid entering highly sensitive data unless the specific tool clearly states how the data is handled.
Many tools include copy or download actions. If a dedicated export is not available, you can usually copy the visible result manually.
Chúng tôi không chỉ thiết kế website, mà còn giúp doanh nghiệp xây dựng thương hiệu số mạnh mẽ. Cung cấp dịch vụ thiết kế website trọn gói từ thiết kế đến tối ưu SEO. Hãy liên hệ ngay với Tấn Phát Digital để cùng tạo nên những giải pháp công nghệ đột phá, hiệu quả và bền vững cho doanh nghiệp của bạn tại Hồ Chí Minh.
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