Google PageSpeed Insights

Google PageSpeed Insights (PSI) is a comprehensive web performance analysis tool that evaluates the performance of a webpage across mobile and desktop devices. It is designed to analyze how well a webpage performs in terms of speed, user experience, and optimization.

Google PageSpeed Insights Report

PSI combines two types of performance data: real-user experience data gathered from the Chrome User Experience Report (CrUX) and lab data generated through Google Lighthouse. While lab and field data can be different, when combined, they offer a comprehensive understanding of a site's performance.

After briefly analyzing the webpage's URL, Google PageSpeed Insights generates a report structured into several sections.

1. Performance

   This section of the report provides an overall Performance Score for a webpage based on key metrics. The score is primarily derived from lab data collected through Lighthouse under simulated conditions. It ranges from 0 to 100 and represents the webpage's overall performance.
   Score ranges

2. Field Data

   Based on data collected from the Chrome User Experience Report (CrUX), the Field Data section captures real-world user experiences on a webpage. It focuses on Web Vitals metrics, such as Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), Interaction to Next Paint (INP), First Contentful Paint (FCP), and Time to First Byte (TTFB).
   Metric results are categorized into three groups that show the distribution of page performance:

• Good - green bar.
• Needs Improvement - amber bar.
• Poor - red bar.
  Additionally, the section reports the 75th percentile values for each metric to highlight the experiences of the slowest users, helping developers identify and address the most frustrating performance issues.
  Origin Summary: part of this field data is the Origin Summary, which aggregates the metrics for all pages from the exact website origin over the last 28 days. Users can view this summary by enabling the Show Origin Summary option. However, field data may only be available for some pages due to insufficient real-user interaction.

2. Lad Data

   Generated through Lighthouse under controlled conditions, the report Analyzes six performance metrics: First Contentful Paint (FCP), Largest Contentful Paint (LCP), Speed Index (SI), Time to Interactive (TTI), Total Blocking Time (TBT), and Cumulative Layout Shift (CLS). This report helps identify optimization opportunities and diagnose issues by running consistent tests. For clarity, the scores of the metrics are evaluated and displayed with an icon:

• Good - green circle.
• Needs Improvement - amber square.
• Poor - red triangle.
  Audits: each category in the Lab Data report contains audits that offer guidance on improving the webpage's user experience.

Google PageSpeed Insights Advantages

Using PSI offers several significant benefits for improving website performance.

• Identifies bottlenecks: PSI identifies what’s slowing the website, such as heavy images or excessive scripts. Fixing these issues will load pages faster and improve the overall user experience.
• Improves search rankings: by addressing Core Web Vitals, PSI helps the website align with Google’s performance standards. Better scores can boost rankings in search results.
• Enhances user experience: PageSpeedInsights uses real-world data to reflect how users interact with your site. Optimizing performance ensures smoother navigation across all devices and networks.
• Provides actionable insights: the tool offers straightforward, step-by-step suggestions for improvement to enhance the website's SEO. Fixing these issues helps achieve measurable gains in speed and usability.
• Boosts engagement and conversions: faster websites reduce bounce rates and keep users engaged longer, leading to more interactions, higher conversions, and better business outcomes.