LCP
Largest Contentful Paint
2.9s
Needs Improvement
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Optimize Main Thread JavaScript Execution
How to optimize learn.wowlearnings.org
Optimize Main Thread JavaScript Execution
Medium Impact+8 points estimated
Why It Matters
2.0 seconds of JavaScript execution time blocks user interactions and increases Total Blocking Time by 150ms.
How to Fix
Break up the large 3.3MB JavaScript chunk using Next.js code splitting at the page level. Implement React.lazy() and Suspense for heavy components to defer non-critical rendering. Use web workers for CPU-intensive tasks and consider moving to React 18's concurrent features to prevent main thread blocking.
0Needs Improvement
What This Score Means
A score of 88 falls in the "Needs Improvement" range (50-89). While it is better than poor (0-49), you should aim for 90+ to provide an optimal user experience and maximize SEO benefits.
This site is slower than approximately 35% of similar sites. The main issues affecting performance are image optimization, JavaScript execution time, and layout stability.
Addressing these issues could improve your conversion rate by 15-20% and boost your search engine rankings.
Core Web Vitals Analysis
INP
Interaction to Next Paint
168ms
Good
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.01
Good
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This Next.js site has good performance with a score of 88/100, but there's significant room for improvement in JavaScript optimization. The biggest issue is excessive JavaScript execution time (2.0 seconds) and unused code, with 284 KiB of unnecessary JavaScript being loaded and 23 KiB of unused CSS slowing down the page. The site takes 7 seconds to become fully interactive and has a Speed Index of 6.2 seconds, primarily due to render-blocking CSS files that could save 620ms if properly deferred. Optimizing your JavaScript bundles, removing unused code, and addressing the render-blocking resources could easily push this site into the 90+ performance range and dramatically improve user experience.
Other Optimization Recommendations
Eliminate CSS Render Blocking Resources
High Impact+12 points estimatedWhy It Matters:
Render-blocking CSS delays LCP by 600ms and FCP by 600ms, significantly impacting perceived load speed.
How to Fix:
Use Next.js built-in CSS optimization by moving critical styles inline with styled-jsx or CSS-in-JS. Split the large 26KB CSS file using dynamic imports for route-specific styles. Implement critical CSS extraction using @critters/webpack-plugin in next.config.js to inline above-the-fold styles.
Reduce Unused JavaScript Bundle Size
High Impact+10 points estimatedWhy It Matters:
284KB of unused JavaScript wastes bandwidth and delays LCP by 150ms while blocking the main thread.
How to Fix:
Enable Next.js tree shaking by using ES6 imports and avoiding default exports for large libraries. Implement dynamic imports with Next.js lazy loading for non-critical components using next/dynamic. Use webpack-bundle-analyzer to identify and remove unused dependencies, particularly the oversized Google Analytics and chunk files.
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Related Performance Analyses
More Next.js Speed Tests
Next.js Performance Resources
Optimize Cache Strategy
Poor caching configuration forces users to re-download resources on repeat visits, missing opportunities for faster load times.
Remove Unused JavaScript Code
356KB of unused JavaScript is bloating your bundle size and slowing down page load without providing value.
Eliminate Render-Blocking CSS Resources
CSS files are blocking initial page render and delaying FCP by 1 second, directly impacting user experience.
Optimize CSS Delivery Strategy
Render-blocking CSS delays First Contentful Paint by 900ms, preventing users from seeing content quickly.