Use the Speed Analysis Lab reports to dig deeper into the performance of a tested web page and identify key indicators related to Core Web Vitals and User Experience.
Access your analysis reports from:
- any web performance test you run (the report is available directly after you execute the test)
- your dashboard and reports tab
- any comparison report
- from any graph of any monitored page
Performance Report breakdown
Retest
See the URL of the tested web page and the date of the current test.
Select the Retest icon to launch a new test within the same configuration.
Structural Analysis Score
- See the structural analysis score (the score is calculated from dozens of best practices tested on your page)
- See a high level summary of the issues, improvements and successes
- Issues (red): All the applied and critical checkpoints from our best practices repository that have not been respected by the tested web page (generally resulting in a 0 score for the specific checkpoint)
- Improvements (orange): All the applied checkpoints that have been partially respected (meaning a score below 90/100)
- Successes (grey): All the successful checkpoints for the tested web page.
- Issues (red): All the applied and critical checkpoints from our best practices repository that have not been respected by the tested web page (generally resulting in a 0 score for the specific checkpoint)
- View visual metrics and replay the video of page loading
Test settings
Use the ‘Edit’ button to launch a new test based on the current report settings or update them based on your needs.
Use the 'Memorize' button to save the configuration of the current test and re use when setting up a web performance test.
Video replay and rendering times
The video replay and rendering times displays the web performance metrics that have been calculated from the video analysis of the web page's loading. Understand the users experience of how the page renders.
Click on the metric name of Start Render, FCP, LCP* and Visually Complete to access their point in time. CLS and Speed Index do not match a point in time but are displayed as video replay is a useful way to better understand the values.
*Selecting the LCP metric will highlight the LCP element on the video replay and will display LCP Event information.
Element: ID/class/filename of the element
Size: Ratio is computed compared to the viewport, based on the LCP element width and height
HTML code: Extract of the HTML code to better identify the LCP element when needed.
Weight: Size of the image file
Path: Full path of the request triggering the LCP
The filmstrip enables you to breakdown the loading of your tested web page frame by frame with regular intervals. Each image in the film strips gets its related rate. This percentage reveals the rate of rendering completion of the step against the final state. The '100%' rate indicates that the 'Visually Complete' status has been reached.
Performance Indicators
View the performance of your page against the web performance metrics.
- Use the Core Web Vitals to understand the performance of the page load:
- Largest Contentful Paint
- Total Blocking Time
- Cumulative Layout Shift
- Use 'Weight' (located on the right) to see the amount of data downloaded by resource type.
- 'Others' refers to any content that does not fit into the other categories. E.g. fonts, videos, etc).
Select the LCP image to open the video replay and rendering times to visualize the LCP element directly in the video replay and see additional details about the LCP element (size, weight, path and HTML code).
Browser errors
Browser warnings indicate the number of errors or warnings issued by the web browser. When there is an error (indicated in red) click on the section to access the details.
Detected Technologies
To carry out a complete audit of your web page, Speed Analysis Lab relies on the detection of the technologies currently used on this page (CMS, web server, frameworks, etc.). This area displays the icons of the technologies that have been detected on the tested page.
Waterfall
The waterfall lists all the network requests (HTTP etc) that have been required to load the page including assets like images, javascript and web service calls.
- The Timings section lists the values of all performance metrics for the page
- The Long Tasks section shows where the browser is busy for more than 50ms and the Total Blocking Time
- The Waterfall section displays the sequential list of all HTTP requests
Priorities
The Tips & Best practices list shows all the applied checkpoints that are used to calculate the overall quality score of your page.
- The advice is ordered according to the priority level defined by the Speed Analysis Lab module
- Each entry presents the stakes related to the best practice, details about the issue and how to solve it
The list is broken down into symbols and colors:
Symbol | Indication | Score details |
Success | Score is higher than 90/100 | |
Improvement | Score is higher than 50/100 or the checkpoint is considered to have few stakes (through a low coefficient) | |
Problem | Score is low the checkpoint has significant stakes | |
Information | A checkpoint where the issues may depend on specific context which cannot be stated further or information that just needs to be brought to your attention |