What causes Cumulative Layout Shift (CLS)?

CLS is commonly caused by images without explicit width and height dimensions, dynamic ads injected without reserved containers, and web fonts loading with layout-shifting fallbacks.

Web Development

Web Performance Optimization: Core Web Vitals, Caching & Critical CSS

Achieve 95+ Google PageSpeed scores by optimizing Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), and Interaction to Next Paint (INP).

Written by Marcus Thorne

Published: 10/06/2026 7 min read

Optimizing for Real-World Speed

Core Web Vitals measure actual user experience: visual stability (CLS), loading performance (LCP), and page responsiveness (INP). Always reserve explicit dimensions for image and ad slots to prevent layout shifts during page render.

Marcus Thorne

Head of Technology & Web Engineering

Marcus is a full-stack engineer and educator who has architected fintech payment gateways, secure authentication engines, and performant data pipelines using modern PHP and MySQL.

Editorial Transparency & Disclaimer: The educational content published on AureviaFin is researched and authored independently. It does not constitute individualized financial, investment, or legal counsel. See our full Financial Disclaimer and Editorial Policy.