PageSpeed Check

The PageSpeed Check measures the performance of a URL on mobile devices and desktop and reveals the most important bottlenecks affecting loading experience and page usage.

In this article3

1. How the tool works in practice
2. Core features and key views
3. Recommended workflow

The tool is particularly useful if you not only want to know that a page is slow, but also which metrics, opportunities, and technical hints are specifically behind it. This turns a general performance question into a solid basis for optimization.

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How the tool works in practice#OK

You enter the URL and start the analysis. The tool then retrieves performance data for mobile and desktop and displays the most important metrics in a directly comparable way.

In addition to the performance score itself, the key individual factors such as Largest Contentful Paint, First Contentful Paint, Total Blocking Time, and Cumulative Layout Shift are also made visible.

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Core features and key views#OK

• Separate evaluation for mobile and desktop: Different usage situations remain clearly identifiable.
• Overview of core metrics: The most important performance values are displayed directly side by side.
• Opportunities: The tool highlights areas with direct potential for improvement.
• Diagnostics: Additional technical hints help with root cause analysis.
• Passed Audits: Areas that are already in good shape are also visible so that the overall status remains easier to assess.

This is particularly useful for relaunches, conversion pages, and mobile landing pages where performance can have a direct impact on usage and visibility.

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Recommended workflow#OK

• Check mobile and desktop separately instead of drawing incorrect conclusions from an average.
• First address the biggest bottlenecks in the Opportunities section before going deeper into fine-tuning.
• Repeat the check after making changes to accurately assess impact and side effects.