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).
|Time to First Byte
|Reception of the first piece of data of the HTML of the page|
||First display on the screen (before that, the page remains blank)|
||Index reflecting the average display speed of the page components. The smaller the better|
|Load Event Start
or Last Visual Change
|The above-the-fold part of the page is displayed with its final state|
||No more network traffic, page is fully loaded|
Core Web Vitals
- Largest Contentful Paint LCP
- Total Blocking Time TBT
- [beta] Cumulative Layout Shift CLS
- [beta] Max Potential First Input Delay Max FID
- HTML responseEnd Time to Last Byte
- DOM Interactive
- DOM Content Loaded Event Start DCL
- DOM Content Loaded Event End
- DOM Complete
- Load Event End
- First Contentful Paint FCP
- Time to (Consistently) Interactive TTI
To find out more, check out our series of blog posts dedicated to the User Timing API.
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.