At a glance the headline numbers for Consent platforms
Consent platforms present on the page.
The consent platforms mix who uses what, and how fast each group loads
Consent platforms. On the fleet: 18.1% quantcast choice, 16.8% complianz, 16.4% civic cookie control. 100.0% of sites use at least one quantcast_choice.
Why this matters for the Core Web Vitals, and where to start fixing it
Consent platforms run before everything else by design, because they gate the other tags. That puts them on the critical path of every first visit. The banner is often the first thing the visitor interacts with, so a slow consent script means the first click of the session is the slow one.
The banner is also a CLS suspect when it pushes content down instead of overlaying it. Overlay it, load the consent script early, and keep it small. It runs on every single first visit, so its weight multiplies.
Chrome field data from 189,915 sites, representing millions of real page loads. How we measured.