LCP
Largest Contentful Paint
4.7s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Reduce Unused Clerk JavaScript Code
How to optimize donnie.cl
Next.js SiteScore: 81/100Analyzed January 2026
Reduce Unused Clerk JavaScript Code
High Impact+15 points estimated
Why It Matters
Unused JavaScript wastes 279 KiB and delays LCP by 450ms, significantly impacting Core Web Vitals.
How to Fix
Configure Clerk to load only required authentication components using dynamic imports. Implement code splitting in Next.js to defer Clerk loading until authentication is needed. Use Clerk's tree-shaking friendly imports to exclude unused UI components.
0Needs Improvement
What This Score Means
A score of 81 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
91ms
Good
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 good performance with a score of 81/100, but has room for significant improvement. The biggest issue is excessive unused JavaScript from Clerk authentication services, which wastes 279 KiB and delays page interactivity to 6.8 seconds - well above the recommended 2.5 seconds. The site's Largest Contentful Paint of 4.7 seconds is also slower than ideal, partially caused by render-blocking CSS files that could save 600ms if optimized. Removing unused JavaScript code, deferring non-critical scripts, and inlining critical CSS would likely boost the performance score into the 90s and dramatically improve user experience.
Other Optimization Recommendations
Remove Legacy JavaScript Build Transpilation
Medium Impact+8 points estimatedWhy It Matters:
Legacy polyfills add unnecessary 14 KiB and 150ms LCP delay for modern browsers that don't need them.
How to Fix:
Update your Next.js config to target modern browsers by setting 'browserslist' to exclude old browsers. Configure Babel preset-env with 'esmodules: true' to avoid transpiling modern JavaScript features. Use Next.js 13+ automatic modern/legacy build splitting.
Inline Critical CSS Resources
Medium Impact+10 points estimatedWhy It Matters:
Render-blocking CSS delays First Contentful Paint by 600ms, preventing users from seeing content quickly.
How to Fix:
Use Next.js built-in CSS optimization to automatically inline critical CSS. Move non-critical styles to load asynchronously using next/dynamic. Consider using CSS-in-JS solutions like styled-components for better code splitting.
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Related Performance Analyses
More Next.js Speed Tests
Next.js Performance Resources
Eliminate Duplicate JavaScript Modules
175 KiB of duplicated JavaScript from Nike Design System components is loaded multiple times across bundles.
Fix LCP Image Discovery
The LCP image is not discoverable in the initial HTML, causing a 4-second resource load delay.
Remove Unused JavaScript Code
460 KiB of unused JavaScript is blocking the main thread for 7.3 seconds and delaying LCP by 2.4 seconds.
Fix Page Redirects Chain
Multiple redirects add 1.53 seconds delay before the page even starts loading, directly impacting both FCP and LCP.
Frequently Asked Questions
Keep Your Site Fast After Optimization
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