PageSpeed Insights Optimization Guide Comprehensive reference guide for understanding and improving PageSpeed Insights scores.

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PageSpeed Insights Guide

Comprehensive reference guide for understanding and improving PageSpeed Insights scores.

Learn the metrics

Understand what PageSpeed Insights measures and how scores are calculated.

Review optimization tips

Explore specific optimization strategies for each performance category.

Apply improvements

Follow the prioritized recommendations to improve your page speed scores.

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What Is PageSpeed Insights Guide?

The PageSpeed Insights Guide is a practical reference for understanding and improving your website's performance scores in the tool. It covers how Lighthouse calculates the performance score, what each audit measures, and specific optimization strategies for improving loading speed, interactivity, and visual stability. Page speed directly impacts user experience, conversion rates, and SEO — Google has confirmed that page speed is a ranking factor for both mobile and desktop search.

Why Use PageSpeed Insights Guide?

Explains how PageSpeed Insights scores are calculated
Optimization strategies organized by impact level
Covers all Lighthouse performance audits and opportunities
Connects performance improvements to SEO impact
Practical, actionable recommendations with code examples

Common Use Cases

Performance Optimization

Systematically improve your PageSpeed score using prioritized recommendations.

Client Reports

Explain PageSpeed scores and improvement plans to clients.

Developer Training

Educate development teams on performance best practices.

SEO Audits

Include page speed analysis in comprehensive SEO audits.

Technical Guide

PageSpeed Insights uses Lighthouse to generate performance scores on a 0-100 scale. The score is a weighted average of six metrics: FCP (10%), SI (10%), LCP (25%), TBT (30%), CLS (25%). Scores 90-100 are green (fast), 50-89 orange (moderate), 0-49 red (slow). Key optimization categories: Eliminate render-blocking resources, properly size images, defer offscreen images, minify CSS/JS, enable text compression, use efficient cache policy, reduce server response time (TTFB), avoid excessive DOM size, minimize main-thread work, and reduce JavaScript execution time.

Tips & Best Practices

1
Focus on LCP and TBT first — they have the highest score weight
2
Compress images to WebP/AVIF format for 25-50% size reduction
3
Defer non-critical JavaScript with async/defer attributes
4
Enable Brotli compression for 15-20% better compression than gzip
5
Use a CDN to reduce Time to First Byte (TTFB) globally

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Frequently Asked Questions

Q What is a good PageSpeed score?

Scores 90-100 are considered fast (green). 50-89 is moderate (orange). Below 50 is slow (red). Aim for 90+ for optimal SEO benefit.

Q Does PageSpeed affect SEO?

Yes. Google confirmed page speed is a ranking factor. Core Web Vitals (derived from similar metrics) became a ranking signal in June 2021.

About This Tool

PageSpeed Insights Guide is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.