LCP
Largest Contentful Paint
20.0s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Reduce Unused Code Payload
How to optimize pearsoncars.com
Ruby on Rails SiteScore: 10/100Analyzed February 2026
Reduce Unused Code Payload
Medium Impact+15 points estimated
Why It Matters
2.2MB of unused JavaScript and 485KB unused CSS waste bandwidth and slow parsing.
How to Fix
Use Rails' asset pipeline to tree-shake unused code from your minified bundles. Split vendor libraries from application code using Webpack code splitting. Remove unused FontAwesome icons and keep only required weights.
0Poor
What This Score Means
A score of 10 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
273ms
Needs Improvement
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
1.03
Poor
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This Ruby on Rails site has critical performance issues with a score of just 10/100. The biggest problem is render-blocking resources (CSS and JavaScript files) that are preventing the page from loading quickly, delaying First Contentful Paint by 3.6 seconds and causing a massive 20-second Largest Contentful Paint. The site also suffers from severe layout shifts (1.03 CLS score) primarily caused by unsized images that jump around as they load. Deferring non-critical JavaScript, optimizing or removing unused CSS/JS (474KB of unused CSS alone), and adding proper dimensions to images could dramatically improve load times and user experience by several seconds.
Other Optimization Recommendations
Fix Critical Layout Shifts
High Impact+35 points estimatedWhy It Matters:
Layout shifts score of 1.03 severely impacts user experience and Core Web Vitals.
How to Fix:
Add explicit width='382' height='215' attributes to the unsized video thumbnail image. Set dimensions for the Suzuki logo in header. Use CSS aspect-ratio or min-height to reserve space for dynamically loaded content sections.
Eliminate Render Blocking Resources
High Impact+25 points estimatedWhy It Matters:
Blocking CSS and JavaScript delays First Contentful Paint by 3.6 seconds.
How to Fix:
In your Rails application layout, move non-critical CSS to load asynchronously using media='print' onload="this.media='all'". Defer the 97KB JavaScript bundle using defer attribute. Inline critical above-the-fold CSS directly in the HTML head.
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Related Performance Analyses
More Ruby on Rails Speed Tests
Ruby on Rails Performance Resources
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.
Fix Document Request Latency
Server response delays are blocking initial page render and delaying both LCP and FCP by 400ms.
Frequently Asked Questions
Keep Your Site Fast After Optimization
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