LCP
Largest Contentful Paint
4.8s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Optimize JavaScript Execution Time
How to optimize tamer.web.vercel.app
Next.js SiteScore: 73/100Analyzed January 2026
Optimize JavaScript Execution Time
Medium Impact+6 points estimated
Why It Matters
1.7 seconds of JavaScript execution time is blocking the main thread and delaying Time to Interactive to 8.6 seconds.
How to Fix
Break up long-running JavaScript tasks using React.memo() and useMemo() hooks to prevent unnecessary re-renders. Implement lazy loading with React.lazy() and Suspense for heavy components. Use web workers for CPU-intensive calculations to keep the main thread responsive.
0Needs Improvement
What This Score Means
A score of 73 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
101ms
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 poor performance with a score of 73/100, primarily due to excessive JavaScript blocking the main thread for 2.9 seconds. The biggest issue is render-blocking CSS files that delay both First Contentful Paint and Largest Contentful Paint by 750ms, while 207 KiB of unused JavaScript further slows the site. The Largest Contentful Paint takes a concerning 4.8 seconds, mainly caused by a 2.8-second element render delay. Deferring CSS loading, removing unused JavaScript code, and optimizing the build process could improve performance by several seconds and significantly boost user experience.
Other Optimization Recommendations
Eliminate Render-Blocking CSS
High Impact+12 points estimatedWhy It Matters:
CSS files are blocking initial render and delaying LCP by 750ms, preventing users from seeing content quickly.
How to Fix:
Inline critical CSS for above-the-fold content in your Next.js pages. Use next/dynamic with ssr: false for non-critical components. Configure next.config.js to extract and defer non-critical CSS chunks using the experimental.css option.
Remove Unused JavaScript Code
High Impact+8 points estimatedWhy It Matters:
207 KiB of unused JavaScript is delaying LCP by 300ms and wasting bandwidth on unnecessary code execution.
How to Fix:
Use Next.js dynamic imports to code-split large components and libraries. Analyze your bundle with @next/bundle-analyzer to identify unused dependencies. Implement tree-shaking by using named imports instead of default imports from large libraries.
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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
Once your site is optimized, maintain that speed. Use DeployHQ for zero-downtime, automated deployments—so performance fixes and updates go live safely every time, without breaking your site.
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