Demystifying Cumulative Layout Shift with CLS Windows

As we all know, naming things is hard. Google’s Core Web Vitals are an attempt to help folks new to web performance focus on three key metrics. Not all of these metrics are easy to understand based on their names alone: Largest Contentful Paint (LCP) – When the largest visual element on the page renders First Input Delay (FID) – How quickly a page responds to a user interaction (FID will be replaced by Interaction to Next Paint in March 2024) Cumulative Layout Shift (CLS) – How visually stable a page is Any time a new metric is introduced, it puts the burden on the rest of us to first unpack a