Web Vitals

We automatically gather web vitals statistics for each pane when you have "Show webvitals status" checked in the Global settings (in the top right corner of the app), and these are shown at the bottom of your pane.

When all your web vitals are in the "good" range, it will show a green circle. if there are web vitals that need improvement we show an orange square and show the web vital and its score. For web vitals that score "poor" we show a red triangle and similarly show the Web Vital and the score.

Hover over the icon to get an overview of all Web Vitals and their score. Here too we color Web Vitals orange for "needs improvement" and red for "poor".

Supported web vitals

Core web vitals:

CLS: Cumulative Layout Shift
INP: Interaction to Next Paint
LCP: Largest Contentful Paint

Other web vitals:

FID: First Input Delay
FCP: First Contentful Paint
TTFB: Time To First Byte

Keep in mind that web vitals scoring is non-deterministic to will differ somewhat on each reload.

Compare your experience to the global averages with CrUX Field Data

When you open the Web Vitals popup we will compare the current pane's score to the Field data gathered by CrUX (when available). This way you can see at what percentile your experience sits at, and how your page is doing globally. Use this to compare how closely your experience matches the average of your visitors.

CrUX data is available separately for Mobile and Desktop, Polypane will automatically select the one most applicable to the current pane.

CLS visualisation

Click the eye icon next to the Cumulative Layout Shift score to visualize which elements shifts caused your CLS score. With this visualisation, you can pinpoint the Elements whose CSS you need to fix to improve your CLS.