LCP
Largest Contentful Paint
5.6s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Fix Image Layout Shift Issues
How to optimize reddit.com
Generic SiteScore: 48/100Analyzed January 2026
Fix Image Layout Shift Issues
Medium Impact+8 points estimated
Why It Matters
Unsized images are causing 0.4 CLS score and poor visual stability during load.
How to Fix
Add explicit height and width attributes to all subreddit icon images. Use CSS aspect-ratio property to reserve space before images load. Implement placeholder backgrounds matching final image dimensions to prevent content jumps.
0Poor
What This Score Means
A score of 48 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
138ms
Good
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.40
Poor
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This Reddit page has significant performance issues with a poor score of 48/100. The biggest problem is excessive JavaScript execution time (2.8 seconds of main-thread work), which is blocking the page from loading quickly and causing a very slow Largest Contentful Paint of 5.6 seconds. The site is also suffering from major layout shifts (CLS score of 0.402) primarily caused by unsized images that move content around as they load. Reducing unused JavaScript (which could save 645 KB) and properly sizing images would be the most impactful fixes to improve both loading speed and visual stability.
Other Optimization Recommendations
Eliminate Render-Blocking CSS Resources
High Impact+12 points estimatedWhy It Matters:
Critical CSS files are blocking first paint and delaying LCP by 450ms.
How to Fix:
Inline critical above-the-fold CSS directly in the HTML head. Use media queries to defer non-critical CSS like comment-preview-unit and hui-grid styles. Implement loadCSS() function to asynchronously load remaining stylesheets after page render.
Reduce Unused JavaScript Payload
High Impact+15 points estimatedWhy It Matters:
645KB of unused JavaScript is wasting 1.6 seconds of load time and blocking LCP.
How to Fix:
Split large JavaScript bundles using dynamic imports for Reddit components. Remove or defer reCAPTCHA loading until user interaction is required. Implement tree-shaking to eliminate dead code from concatenated JS files.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Eliminate Render-Blocking Resources and Forced Reflows
Render-blocking CSS delays initial paint by 1,890ms and forced reflows cause 87ms of layout thrashing.
Optimize Images and Enable Caching
Oversized images waste 48 KiB and poor caching policies force unnecessary re-downloads, delaying LCP by 450ms.
Remove Unused CSS and JavaScript
116 KiB of unused CSS and 48 KiB of unused JavaScript are blocking render and delaying LCP by 1,050ms combined.
Remove Unused JavaScript Code
204KB of unused JavaScript delays page load by 1050ms and wastes bandwidth unnecessarily.
Frequently Asked Questions
Keep Your Site Fast After Optimization
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