LCP
Largest Contentful Paint
5.8s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Optimize Image Delivery Format
How to optimize zshn25.github.io
Optimize Image Delivery Format
Medium Impact+8 points estimated
Why It Matters
Converting the 136KB GIF to video format saves 66KB and improves perceived performance.
How to Fix
Replace the vision_transformer.gif with MP4 or WebM video formats for 50% size reduction. Use the HTML video element with autoplay, loop, and muted attributes. Compress remaining WebP images further using tools like Squoosh or ImageOptim to reduce file sizes by 30-50%.
0Poor
What This Score Means
A score of 47 falls in the "Poor" 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
41ms
Good
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
1.00
Poor
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This website has poor performance with a score of 47/100, indicating significant user experience issues. The biggest problem is extremely slow content loading, with the Largest Contentful Paint taking 5.8 seconds and severe layout shifts causing a CLS score of 1.0, both well beyond acceptable limits. The site is also wasting nearly 1MB of bandwidth due to inefficient caching (particularly for fonts and images) and loading 98% unused CSS from FontAwesome. Converting the large GIF to video format, implementing proper browser caching, removing unused CSS, and fixing layout stability issues could dramatically improve performance and user experience by several seconds.
Other Optimization Recommendations
Implement Long-Term Caching Headers
High Impact+25 points estimatedWhy It Matters:
Poor caching wastes 949 KiB and delays LCP by 3.6 seconds on repeat visits.
How to Fix:
Configure your web server to set cache-control headers for static assets to 1 year (31536000 seconds). Add versioning to filenames for cache busting when updates occur. Set expires headers for fonts, images, and CSS to leverage browser caching effectively.
Fix Layout Shift Issues
High Impact+20 points estimatedWhy It Matters:
A CLS score of 1.0 creates jarring user experience and severely impacts Core Web Vitals.
How to Fix:
Add explicit dimensions to all images using width and height attributes. Remove or optimize the forced reflow in main.js at line 135 by batching DOM reads and writes. Reserve space for dynamic content with CSS min-height properties to prevent content jumping.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Optimize Image Delivery Performance
Oversized and unoptimized images waste 116KB and delay LCP by 150ms with poor user experience.
Reduce JavaScript Bundle Size
Unused JavaScript accounts for 358KB of waste, delaying LCP by 900ms and blocking main thread execution.
Eliminate Render Blocking Resources
CSS files are blocking the initial page render for 480ms and delaying First Contentful Paint.
Implement Efficient Asset Caching
Poor cache policies waste 955 KiB on repeat visits and slow LCP by 4.75 seconds.