Learn Web Performance
Everything you need to know about making your website faster
Why Performance Matters
of mobile users abandon sites that take over 3 seconds to load
decrease in conversions for every additional second of load time
improvement in conversion rate can be achieved with 100ms faster load times
Core Web Vitals Explained
Largest Contentful Paint
Loading Performance
LCP measures when the largest content element becomes visible in the viewport. This is typically a hero image, video, or large text block. Users perceive this as the moment the page becomes 'useful'.
How to improve:
- Optimize and compress your largest images
- Use a CDN to serve content closer to users
- Preload critical resources
Interaction to Next Paint
Responsiveness
INP measures how quickly your page responds to user interactions like clicks, taps, and keyboard input. A low INP means users feel the page is responsive and interactive.
How to improve:
- Break up long JavaScript tasks
- Defer non-critical JavaScript
- Optimize event handlers
Cumulative Layout Shift
Visual Stability
CLS measures how much visible content shifts unexpectedly. Layout shifts can be frustrating when users accidentally click the wrong element because something moved.
How to improve:
- Always set dimensions on images and videos
- Reserve space for ads and embeds
- Avoid inserting content above existing content
External Resources
web.dev - Web Vitals
Official Google documentation on Core Web Vitals and how to optimize them.
Google Web Performance
Google's comprehensive guide to web performance optimization.
Lighthouse Documentation
Learn about Lighthouse, the engine powering PageSpeed Insights.
Case Studies
Real-world examples of companies improving their web performance.