LCP
Largest Contentful Paint
44.3s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Fix Layout Shifts from Carousel
How to optimize pearsoncars.com
Ruby on Rails SiteScore: 19/100Analyzed February 2026
Fix Layout Shifts from Carousel
Medium Impact+10 points estimated
Why It Matters
Layout shifts (CLS: 0.253) are caused by carousel elements moving during page load, hurting user experience.
How to Fix
Add explicit dimensions to all carousel images in your Rails views using width and height attributes. Reserve space for carousel controls with CSS. Use Rails image helpers with size parameters: image_tag('image.webp', size: '412x309', loading: 'lazy').
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
267ms
Needs Improvement
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.25
Poor
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 an enormous 12.5 MB page size combined with render-blocking CSS files that delay content from appearing for nearly 4 seconds, resulting in painfully slow load times of 19+ seconds for first content and 44+ seconds for the main image. The site is also plagued by layout shifts (elements jumping around as the page loads) and massive amounts of unused JavaScript and CSS code that could be removed. Fixing the render-blocking resources, compressing images, and removing unused code could dramatically improve performance and make the site usable again.
Other Optimization Recommendations
Eliminate Render-Blocking CSS Resources
High Impact+25 points estimatedWhy It Matters:
Render-blocking CSS is delaying First Contentful Paint by 3.85 seconds, severely impacting user experience.
How to Fix:
In your Rails application, move critical CSS inline in the <head> section and defer non-critical CSS using media='print' onload="this.media='all'". Use Rails asset pipeline to split CSS into critical and non-critical bundles. Consider using the 'critical' gem to automatically extract above-the-fold CSS.
Reduce Unused JavaScript Bundles
High Impact+30 points estimatedWhy It Matters:
2.2MB of unused JavaScript is blocking the main thread and delaying LCP by 11.85 seconds.
How to Fix:
Audit your Rails application's JavaScript dependencies and remove unused gems from your Gemfile. Use Webpack Bundle Analyzer to identify large unused modules. Defer YouTube embed scripts and reCAPTCHA until user interaction using dynamic imports or the 'defer' attribute.
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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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