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 JavaScript Bundle Splitting
How to optimize staging.learn.wowlearnings.org
Optimize JavaScript Bundle Splitting
High Impact+15 points estimated
Why It Matters
2.9 seconds of JavaScript execution time blocks the main thread and delays Time to Interactive by 11.2 seconds.
How to Fix
Use Next.js dynamic imports to code-split large components and defer non-critical JavaScript. Remove 285KB of unused JavaScript by tree-shaking unused dependencies. Configure webpack bundle analyzer to identify and eliminate dead code in your build process.
0Needs Improvement
What This Score Means
A score of 69 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
439ms
Needs Improvement
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 poor performance with a score of 69/100, primarily due to excessive JavaScript processing that's blocking user interactions. The biggest problem is that it takes 11.2 seconds for the page to become fully interactive, caused by 5.7 seconds of main-thread blocking from heavy script evaluation and unused code. The site is loading 285KB of unused JavaScript and 29KB of unused CSS, while render-blocking stylesheets are delaying content visibility by nearly a second. Removing unused code, optimizing JavaScript bundles, and deferring non-critical resources could improve the score by 25+ points and dramatically enhance user experience.
Other Optimization Recommendations
Eliminate Render Blocking CSS Resources
High Impact+12 points estimatedWhy It Matters:
Render blocking CSS delays LCP by 900ms and prevents users from seeing content quickly.
How to Fix:
Inline critical CSS for above-the-fold content in your Next.js pages using styled-jsx or CSS-in-JS. Defer non-critical CSS using next/dynamic with { ssr: false } for components below the fold. Split the large 31KB CSS bundle into smaller chunks using CSS modules.
Remove Legacy JavaScript Polyfills
Medium Impact+8 points estimatedWhy It Matters:
Unnecessary polyfills add 40KB of code that modern browsers don't need, slowing down execution.
How to Fix:
Update your Next.js browserslist configuration to target modern browsers (ES2017+). Configure Babel to exclude unnecessary polyfills for Array.prototype.at, Object.hasOwn, and other baseline features. Use @babel/preset-env with browserslist integration for optimal transpilation.
Keep Your Site Fast After Optimization
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Related Performance Analyses
More Next.js Speed Tests
Next.js Performance Resources
Optimize JavaScript Execution Time
2.2 seconds of JavaScript execution time is creating 580ms of Total Blocking Time, hurting user interactivity.
Reduce Unused JavaScript Payload
285KB of unused JavaScript is blocking the main thread and delaying LCP by 1.05 seconds.
Remove Legacy JavaScript Polyfills
Unnecessary polyfills add 40KB of code that modern browsers don't need, slowing down execution.
Eliminate Render-Blocking CSS Resources
Render-blocking CSS is delaying LCP by 1.1 seconds, preventing users from seeing meaningful content.