How the SEOForge speed test works
SEOForge measures the speed and performance of one page for free, using the metrics Google relies on via PageSpeed Insights (Lighthouse).
The analysis covers:
- Page loading speed
- Core Web Vitals
- Content rendering
- Blocking resources
- Technical issues impacting SEO
The test analyses either the mobile or the desktop version. Test mobile first: Google now primarily indexes sites based on their mobile version.
What you get with the test
At the end of the analysis, you receive:
- A detailed analysis of loading performance
- Core Web Vitals scores (LCP, CLS, INP)
- Identification of critical technical issues
- Prioritized optimization recommendations
- A clear foundation to improve your natural search ranking
This data helps understand why a site may lose positions in search results.
Why website speed is essential for SEO
Website performance is a key factor in modern SEO. A slow site directly affects user experience, bounce rate, and visibility in search engines.
Impact on natural search ranking
Google takes loading speed and performance signals into account in its ranking algorithm. A slow site can: Lose positions in search results, Be less well indexed, Offer a poor mobile experience
Core Web Vitals and user experience
Core Web Vitals measure the real user experience:
- LCP (Largest Contentful Paint): speed of main content display
- CLS (Cumulative Layout Shift): visual stability
- INP (Interaction to Next Paint): responsiveness to interactions
Poor scores indicate technical issues that harm usability and SEO.
Speed and conversion rates
A fast site: Improves visitor engagement, Reduces bounce rate, Increases conversions. Even a few extra seconds of loading can have a negative impact on a website's business performance.
Common issues detected by the speed test
SEOForge identifies the most frequent technical problems affecting website performance.
High loading time
A loading time that's too long is often caused by: Heavy files, Poor server configuration, Unoptimized code. These issues slow down indexing and penalize natural search ranking.
Unoptimized images
Images that are too large or improperly formatted are one of the main causes of slowness. Image optimization often provides quick SEO performance gains.
Blocking JavaScript
Blocking JavaScript prevents quick content display. Deferring or optimizing scripts improves speed, visual stability, and user experience.
CLS, LCP, INP issues
Layout shifts, slow main content loading, and delayed interactions are negative signals for Google and users.
Study the causes of layout shifts such as adding or removing elements, or changing fonts during page load.
Is PageSpeed Insights enough?
PageSpeed Insights provides useful data, but is often difficult to interpret for non-experts.
SEOForge helps you:
- Understand the real origin of performance issues
- Prioritize the most effective optimizations
- Facilitate the work of developers and SEO agencies
- Transform technical data into concrete actions
Frequently Asked Questions About Web Performance
Why is website speed important for SEO?
Speed directly influences user experience and natural search ranking. Google uses performance signals to rank sites in search results, especially on mobile.
What is the difference between the speed test and a technical SEO audit?
The speed test measures one page: speed, Core Web Vitals and the technical points that weigh on SEO. The technical SEO audit, done by our team, covers the whole site: crawl, indexation, architecture, structured data, with a prioritised roadmap.
How often should you analyze a website's performance?
It is recommended to run the speed test again after each major site update, or regularly to detect technical issues that could affect visibility in search engines.
What do you keep from a test?
The tested URL, the date, the scores and the list of points found, the test duration and, for 30 days, an irreversible fingerprint of your IP address to detect abuse. Never the page content. This data serves to run and improve the tool; it is deleted after 24 months. If you request the report by e-mail, the test is attached to your request. Privacy policy
Wondering if your site is fast enough for SEO? A free speed test is the first step to identify technical barriers and sustainably improve your visibility in search results.