Web performance directly impacts your bottom line. If a website takes longer than 3 seconds to load, over 50% of mobile users will bounce. Google enforces this behavior by ranking fast websites higher. This performance criteria is grouped into Google's Core Web Vitals: LCP, CLS, and INP.
Understanding the Core Metrics
Largest Contentful Paint (LCP) measures how quickly the main content of a page loads. Cumulative Layout Shift (CLS) tracks visual stability, ensuring buttons or text do not shift unexpectedly while loading. Interaction to Next Paint (INP) measures site responsiveness when users click links or buttons.
Optimization Techniques for React & Vite
To build high-performance React applications, you must optimize how JavaScript bundles are loaded. Using route-based code splitting via React.lazy() and Suspense ensures users only download the code they need for the current page. Preloading core web fonts, compressing SVGs, and avoiding heavy, render-blocking scripts are critical steps to achieving sub-second load times.
Related Services
Explore related bespoke engineering pathways from the YUKTRON team:
Frequently Asked Questions
Q: What is a good LCP score?
A good Largest Contentful Paint score is under 2.5 seconds. Anything above 4.0 seconds is considered poor performance.