LCP
Largest Contentful Paint
4.1s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Reduce JavaScript Execution Time
How to optimize sciencereader.com
Generic SiteScore: 54/100Analyzed February 2026
Reduce JavaScript Execution Time
High Impact+15 points estimated
Why It Matters
JavaScript blocks the main thread for 2.9 seconds, causing 1,580ms Total Blocking Time and poor interactivity.
How to Fix
Remove unused JavaScript from Google Analytics (69% unused) and Swiper library (97% unused). Use WP Rocket or Perfmatters to defer non-critical scripts until after page load. Consider replacing heavy jQuery with vanilla JavaScript for simple interactions.
0Needs Improvement
What This Score Means
A score of 54 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
1447ms
Poor
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 science website has poor performance with a score of 54/100, indicating significant user experience issues. The biggest problem is render-blocking resources, particularly jQuery and CSS files that are preventing the page from loading quickly - fixing this could save 450ms in First Contentful Paint alone. The site is also suffering from excessive JavaScript execution time (2.9 seconds) and poorly optimized images that are much larger than needed for their display size, wasting 280KB of data. Additionally, the site has very long blocking times (1,580ms) that make the page feel unresponsive, with users waiting over 9 seconds before they can fully interact with the content.
Other Optimization Recommendations
Optimize Image Delivery and Compression
High Impact+18 points estimatedWhy It Matters:
Images are oversized and poorly compressed, delaying LCP by 1.15 seconds and wasting 280 KiB.
How to Fix:
Install ShortPixel or Imagify to automatically compress WebP images by 40-60%. Configure responsive images in WordPress to serve appropriately sized images (219x123) instead of oversized 430x430 versions. Use srcset attributes to deliver optimal image sizes for different screen sizes.
Extend Browser Cache Lifetimes
Medium Impact+8 points estimatedWhy It Matters:
Short cache durations force unnecessary re-downloads, adding 300ms to LCP on repeat visits.
How to Fix:
Increase cache headers for static assets to 1 year (31536000 seconds) via .htaccess or WordPress caching plugin. Set Google Analytics script cache to at least 1 week. Configure your CDN or hosting provider to serve assets with proper cache-control headers.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Remove Unused JavaScript Code
Google Tag Manager scripts contain 139KB of unused code, slowing LCP by 600ms and wasting processing time.
Optimize Video File Caching
17MB of video content has zero cache lifetime, forcing full re-downloads on every visit and wasting 69MB of bandwidth.
Defer Render-Blocking JavaScript
JavaScript files are blocking initial page render, delaying FCP by 750ms and preventing users from seeing content.
Remove Unused CSS and JavaScript
136KB of unused JavaScript and 63KB of unused CSS waste bandwidth and slow down page parsing.
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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