LCP
Largest Contentful Paint
7.0s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Eliminate Unused CSS Rules
How to optimize deployhq.com
Ruby on Rails SiteScore: 69/100Analyzed December 2025
Eliminate Unused CSS Rules
High Impact+12 points estimated
Why It Matters
92% of your CSS (35 KiB) is unused, adding unnecessary 150ms to LCP.
How to Fix
Use PurgeCSS with your Rails asset pipeline to remove unused styles. Split critical above-the-fold CSS into a separate file. Configure Rails to inline critical CSS and defer non-critical styles using stylesheet_link_tag with media='print' onload trick.
0Needs Improvement
What This Score Means
A score of 69 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
64ms
Good
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 Ruby on Rails site has poor performance with a score of 69/100, primarily due to a severely delayed Largest Contentful Paint of 7.0 seconds. The biggest issue is excessive unused JavaScript (138 KiB worth), particularly from Google Analytics and cookie consent scripts, which is adding 600ms to load times. Additionally, the site is loading 35 KiB of unused CSS (92% of the total stylesheet) and lacks proper minification of assets. Cleaning up unused code, minifying JavaScript and CSS files, and optimizing third-party scripts could improve the score by 15-20 points and dramatically speed up the user experience.
Other Optimization Recommendations
Remove Unused JavaScript Code
High Impact+18 points estimatedWhy It Matters:
Unused JavaScript is wasting 138 KiB and delaying LCP by 600ms, severely impacting page load performance.
How to Fix:
Use webpack-bundle-analyzer to identify unused code in your Rails asset pipeline. Remove or defer Google Tag Manager and Usercentrics scripts until after page load. Configure Rails to lazy-load analytics scripts using Turbo events.
Add Image Dimensions
Medium Impact+8 points estimatedWhy It Matters:
Missing width/height on logo images causes layout shifts that hurt user experience and CLS scores.
How to Fix:
Add explicit width and height attributes to all img tags, especially the GitHub, GitLab, and Bitbucket logos. Use Rails image helpers with size parameter: image_tag('logo.svg', size: '32x32'). Set CSS aspect-ratio for responsive images to prevent layout shifts.
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Related Performance Analyses
More Performance Analyses
Ruby on Rails Performance Resources
Add Image Dimensions
Missing width/height on logo images causes layout shifts that hurt user experience and CLS scores.
Add Image Dimensions and Minify Assets
Missing image dimensions cause layout shifts and unminified assets add unnecessary parsing time.
Remove Unused JavaScript Code
Unused JavaScript is wasting 138 KiB and delaying LCP by 600ms, severely impacting page load performance.
Fix Page Redirects Immediately
Multiple redirects are adding 5.6 seconds to your LCP, which is causing the critical performance bottleneck.
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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