PageSpeed
Speed analysis: Core Web Vitals, performance metrics, recommendations
Site speed analysis using Google PageSpeed Insights methodology: measures Core Web Vitals — LCP, CLS, INP, FCP, TTFB. Returns a 0-100 performance score (Mobile + Desktop), with improvement opportunities (lazy-loading, compression, minify, image optimization). Includes field data (real-user metrics) from CrUX.
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Why Does Site Speed Matter?
Page load speed directly impacts conversion, SEO rankings, and user satisfaction. Google uses Core Web Vitals as a ranking factor. Every extra second of load time cancost up to 7% in conversions.
Lighthouse Analysis
Google Lighthouse-based analysis: Performance, Accessibility, Best Practices, SEO.
Core Web Vitals
LCP (rendering), FID (interactivity), CLS (visual stability) — key Google metrics.
Resource Analysis
Breakdown by type: HTML, CSS, JavaScript, images, fonts. Size, request count, blocking resources.
Actionable Advice
Specific recommendations with savings estimates: image compression, caching, minification, etc.
Mobile vs Desktop
- Tested on Moto G Power emulation (slow CPU)
- Network: 4G (1.6 Mbps, 150ms RTT)
- Stricter speed scoring
- Google indexes mobile-first
- Priority for SEO optimization
- High CPU performance
- Fast connection without throttling
- Scores typically 20-40 points higher
- Important for B2B and corporate sites
- Use for baseline comparisons
Who uses this
SEO
Core Web Vitals for rankings
Developers
performance optimization
Marketers
speed = conversions
DevOps
performance regression
Common Mistakes
async/defer block rendering. Move to end or add attribute.Cache-Control, the browser reloads CSS/JS on every visit.Best Practices
loading="lazy" for images below the fold.brotli on;Cache-Control: max-age=31536000, immutable. HTML: max-age=0, s-maxage=60.<link rel="preload"> for fonts and CSS. Reduces LCP by 200-500ms.Get more with a free account
Speed check history, competitor comparison and PageSpeed monitoring.
Sign up freePageSpeed Performance Analysis
Analyze website performance using Google PageSpeed Insights API. Get Core Web Vitals metrics (LCP, FID, CLS, INP), performance score, accessibility audit, and actionable optimization recommendations. Test both mobile and desktop versions. Essential for SEO, user experience optimization, and meeting Google ranking requirements.
The speed test analyzes Core Web Vitals (LCP, FID, CLS), total page weight, number of requests, and server response time. Results include actionable recommendations for improving load time, such as image optimization, script deferral, and cache configuration.
Run speed tests from Russia to check performance for CIS audiences. Compare results before and after optimization to measure improvement. For server-side issues, check security headers and DNS configuration. Set up monitoring to track performance over time.
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Frequently Asked Questions
What is PageSpeed?
PageSpeed is a metric for web page loading performance. It includes Time to First Byte (TTFB), First Contentful Paint (FCP), Largest Contentful Paint (LCP), and other metrics. Fast sites get advantages in SEO and conversion.
What are Core Web Vitals?
Core Web Vitals are three key Google metrics: LCP (speed of main content loading, target < 2.5s), INP (responsiveness to interaction, target < 200ms), CLS (visual stability, target < 0.1). They affect search ranking.
How to improve page load speed?
Key methods: image optimization (WebP, compression), CSS/JS minification, enabling Gzip/Brotli, using a CDN, caching (Cache-Control), lazy loading images, preloading critical resources (preload).
What is LCP, FID, CLS?
LCP (Largest Contentful Paint) is the time to load the largest element. FID (First Input Delay) is the delay of first interaction (replaced by INP). CLS (Cumulative Layout Shift) is the total layout shift during loading.
How does page speed affect SEO?
Google uses Core Web Vitals as a ranking factor. Slow sites lose positions, increase bounce rate, and reduce conversion. According to Google, a 1-second loading delay reduces conversion by 7%.
What is TTFB and how to improve it?
TTFB (Time to First Byte) is the time from sending a request to receiving the first byte of the response. Target: under 800ms. Improve with: fast hosting, server-side caching, CDN, optimizing DB queries, Redis/Memcached.
Why is Gzip/Brotli needed?
Gzip and Brotli are compression algorithms that reduce transferred data size by 60-90%. Brotli is 15-25% more efficient than Gzip for text content. Both are supported by all modern browsers and servers.
Related guides
Longer-form reading on this topic from the knowledge base.
Continuous Core Web Vitals monitoring
Track LCP, INP, CLS from real visitors (RUM) — catch regressions before SEO impact.