LCP
Largest Contentful Paint
3.5s
Needs Improvement
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Eliminate Unused JavaScript Code
How to optimize staging.learn.wowlearnings.org
Eliminate Unused JavaScript Code
High Impact+15 points estimated
Why It Matters
285 KiB of unused JavaScript is blocking the main thread and increasing Total Blocking Time by 950ms.
How to Fix
Use Next.js dynamic imports with React.lazy() to code-split large components. Remove Google Analytics if not essential or switch to Partytown for off-main-thread execution. Enable tree-shaking in your webpack config and audit dependencies for unused exports using webpack-bundle-analyzer.
0Needs Improvement
What This Score Means
A score of 62 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
256ms
Needs Improvement
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.00
Good
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This Next.js site has poor performance with a score of 62/100, indicating significant user experience issues. The biggest problem is excessive JavaScript execution taking 4 seconds to complete, which blocks user interactions and delays page responsiveness by nearly 11 seconds. The site is loading 285 KiB of unused JavaScript code and 29 KiB of unused CSS, while also suffering from inefficient image delivery and forced browser reflows that further slow down the page. Reducing JavaScript bundle sizes, removing unused code, and optimizing the CSS delivery could improve the performance score by 25+ points and dramatically enhance user experience.
Other Optimization Recommendations
Remove Render-Blocking CSS Resources
High Impact+12 points estimatedWhy It Matters:
CSS files are delaying LCP by 500ms and preventing the page from rendering critical content immediately.
How to Fix:
Inline critical CSS directly in the HTML head using Next.js styled-jsx or CSS-in-JS. Move non-critical styles to load after first paint using next/dynamic with ssr: false. Use CSS media queries to defer non-essential stylesheets like print styles.
Optimize Image Delivery and Sizing
Medium Impact+8 points estimatedWhy It Matters:
Course thumbnail images are 2x larger than needed, wasting 31 KiB and potentially affecting LCP timing.
How to Fix:
Update Next.js Image component srcSet to include smaller breakpoints (284w, 568w). Use the 'sizes' prop to match actual display dimensions: sizes='(max-width: 640px) 284px, 568px'. Consider using next-optimized-images or Cloudinary for automatic responsive image generation.
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Related Performance Analyses
More Next.js Speed Tests
Next.js Performance Resources
Optimize Image Delivery and Sizing
Course thumbnail images are 2x larger than needed, wasting 31 KiB and potentially affecting LCP timing.
Remove Render-Blocking CSS Resources
CSS files are delaying LCP by 500ms and preventing the page from rendering critical content immediately.
Update JavaScript Build Target
Legacy JavaScript polyfills add 40 KiB of unnecessary code that modern browsers don't need.
Reduce Unused JavaScript Bundle
285 KiB of unused JavaScript is unnecessarily delaying page load and blocking the main thread.