Web Performance Metrics

Web performance measurement is not limited to a single "load time" metric (see our article "Load time is out!"). There are many web performance indicators, each of which fulfills a specific role. Some indicators have a technical scope, while others aim to reveal the user experience related to page loading. Understanding the metrics you're using is a key part of web performance management.

Whatever is the Dareboost feature you're using (analysis reports, comparison reports, web page monitoring or user journey monitoring, we offer dozens of performance metrics that you can easily benefit from.

You'll find below the available metrics with an access to detailed explanations (about their roles, their advantages and limitations, and some tips to use them efficiently).

Standard Timings

Name Summary
Time to First Byte
TTFB
Reception of the first piece of data of the HTML of the page
Start Render
First display on the screen (before that, the page remains blank)
Speed Index
Index reflecting the average display speed of the page components. The smaller the better
Load Event Start
or onload
The page and its direct dependencies are loaded (images, JavaScript, etc. but iframes are ignored)
Visually Complete
or Last Visual Change
The above-the-fold part of the page is displayed with its final state
Fully Loaded
No more network traffic, page is fully loaded

Core Web Vitals

Advanced timings

Custom timings

Dareboost automatically collects your custom indicators (you can create your own metrics to fit your specific needs). It can be set up on your pages very easily, thanks to a standard JavaScript interface, supported by all recent browsers (no external library required on your site).
To find out more, check out our series of blog posts dedicated to the User Timing API.

IMPORTANT!
Keep in mind that all your speed tests, whatever is the performance indicator you're focusing on, rely on the used context, particularly the configured bandwidth and latency.

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