LCP
Largest Contentful Paint
39.7s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Fix Image Dimensions for Layout Stability
How to optimize pearsoncars.com
Ruby on Rails SiteScore: 19/100Analyzed February 2026
Fix Image Dimensions for Layout Stability
Medium Impact+8 points estimated
Why It Matters
Unsized images cause 0.211 CLS score as content jumps during load, especially the video thumbnail causing major shifts.
How to Fix
Add explicit width and height attributes to all image tags in your Rails views. Set CSS aspect-ratio properties for responsive images. Reserve space for the video thumbnail container with min-height to prevent layout shifts during loading.
0Poor
What This Score Means
A score of 19 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
349ms
Needs Improvement
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.21
Needs Improvement
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This Ruby on Rails site has severe performance issues with a critically low score of 19/100. The biggest problem is render-blocking CSS files that are preventing the page from displaying content for nearly 20 seconds, with First Contentful Paint taking 19.3 seconds and Largest Contentful Paint reaching an extreme 39.7 seconds. The site is loading over 2MB of unused JavaScript (especially from YouTube and reCAPTCHA), has no caching configured for images and assets, and suffers from significant layout shifts caused by unsized images. Immediate fixes should focus on deferring non-critical CSS, removing unused JavaScript, implementing proper caching headers, and adding explicit dimensions to images - these changes could potentially improve the performance score by 50+ points and make the site actually usable for visitors.
Other Optimization Recommendations
Remove Unused JavaScript Resources
High Impact+35 points estimatedWhy It Matters:
Unused JavaScript totaling 2,179 KiB is delaying LCP by 10.7 seconds and blocking page interactivity.
How to Fix:
In your Rails application, remove or defer YouTube embed scripts and reCAPTCHA until user interaction. Use dynamic imports for third-party scripts. Configure your asset pipeline to exclude unused JavaScript libraries from the main bundle.
Implement Proper Image Caching Headers
High Impact+25 points estimatedWhy It Matters:
Images totaling 7,425 KiB lack cache headers, causing repeat downloads and delaying LCP by 6.7 seconds.
How to Fix:
Configure your Rails application to set long-term cache headers for static assets. Add 'expires 1y' and 'Cache-Control: public, immutable' to your nginx/Apache config for image files. Use Rails asset pipeline fingerprinting to enable aggressive caching.
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Related Performance Analyses
More Ruby on Rails Speed Tests
Ruby on Rails Performance Resources
Reduce Unused Code Payload
2.2MB of unused JavaScript and 485KB unused CSS waste bandwidth and slow parsing.
Fix Critical Layout Shifts
Layout shifts score of 1.03 severely impacts user experience and Core Web Vitals.
Add Image Dimensions and Fonts
Missing width/height attributes cause layout shifts during load, hurting CLS and user experience.
Optimize Image Compression and Sizing
Images are oversized and poorly compressed, wasting 25KB of bandwidth and slowing page load.
Frequently Asked Questions
Keep Your Site Fast After Optimization
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