LCP
Largest Contentful Paint
0.8s
Good
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Enable Advanced Browser Caching
How to optimize oreillyauto.com
Generic SiteScore: 100/100Analyzed January 2026
Enable Advanced Browser Caching
Low Impact+1 points estimated
Why It Matters
Optimizing cache headers ensures consistently fast repeat visits and maintains your excellent performance score.
How to Fix
Set long-term cache headers for static assets (images, CSS, JS) using Cache-Control: max-age=31536000. Implement service worker for advanced caching strategies. Use ETags for dynamic content validation.
0Good
What This Score Means
A score of 100 falls in the "Good" 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
16ms
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 website achieves an excellent performance score of 100/100, indicating fast loading times and good user experience overall. However, there's one mobile usability issue that could affect user interactions - the viewport isn't fully optimized for mobile devices, which may cause a slight delay of up to 300 milliseconds when users tap on buttons or links on mobile phones. While this doesn't impact the current performance score, fixing the mobile viewport configuration would eliminate these potential tap delays and ensure the smoothest possible mobile browsing experience. The site appears to use standard web technologies without a specific framework like WordPress or React.
Other Optimization Recommendations
Optimize Mobile Viewport Meta Tag
Medium Impact+3 points estimatedWhy It Matters:
Current viewport configuration causes 300ms tap delays on mobile interactions, directly impacting INP scores.
How to Fix:
Add or update the viewport meta tag to <meta name="viewport" content="width=device-width, initial-scale=1">. Remove any maximum-scale or user-scalable=no restrictions. Test touch interactions to ensure immediate response without delays.
Implement Critical Resource Preloading
Low Impact+1 points estimatedWhy It Matters:
With a perfect performance score, preloading key resources can further optimize LCP for varying network conditions.
How to Fix:
Add preload links for hero images and critical CSS in the HTML head. Use <link rel="preload" as="image" href="hero.jpg"> for above-the-fold images. Preload custom fonts with crossorigin attribute to prevent layout shifts.
Want to Analyze YOUR Website?
Get AI-powered performance insights with actionable fixes in 30 seconds
Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Implement Critical Resource Preloading
With a perfect performance score, preloading key resources can further optimize LCP for varying network conditions.
Optimize Mobile Viewport Meta Tag
Current viewport configuration causes 300ms tap delays on mobile interactions, directly impacting INP scores.
Add Explicit Image Dimensions
Images without width/height attributes cause layout shifts and poor user experience as they load.
Remove Unused JavaScript and CSS
57KB of unused JavaScript and 30KB of unused CSS are consuming network bandwidth and delaying LCP by 450ms combined.
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.
Explore DeployHQ →Trusted by engineering teams shipping high-performance sites