LCP
Largest Contentful Paint
3.8s
Needs Improvement
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Remove Unused JavaScript Bundles
How to optimize customboxeshub.com
Remove Unused JavaScript Bundles
High Impact+20 points estimated
Why It Matters
4.7MB of unused JavaScript is consuming bandwidth and causing 10+ seconds of execution time.
How to Fix
Defer or remove reCAPTCHA until user interaction is needed. Eliminate duplicate Bootstrap libraries (you're loading both v5.3.1 and v5.3.3). Use tree-shaking to remove unused portions of jQuery and other libraries. Load third-party scripts asynchronously with async or defer attributes.
0Poor
What This Score Means
A score of 43 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
380ms
Needs Improvement
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.01
Good
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This website has poor performance with a concerning score of 43/100. The biggest problem is excessive JavaScript that's severely slowing down the site - there's nearly 5MB of unused JavaScript code and scripts are taking over 10 seconds to execute, creating a painfully long 70.6-second load time before users can interact with the page. Additionally, render-blocking CSS files are delaying the initial page display by nearly 3 seconds, and the site is loading multiple versions of Bootstrap unnecessarily. Removing unused JavaScript, optimizing CSS delivery, and cleaning up duplicate code libraries could dramatically improve performance and user experience.
Other Optimization Recommendations
Eliminate Render Blocking CSS
High Impact+25 points estimatedWhy It Matters:
Critical CSS files are blocking initial render for 2.8 seconds, severely delaying LCP and FCP.
How to Fix:
Inline critical CSS for above-the-fold content directly in the HTML head. Use media='print' onload='this.media="all"' to defer non-critical stylesheets like plugin.css and style.css. Consider splitting large CSS files and only loading what's needed for the current page.
Optimize Images and Add Dimensions
Medium Impact+8 points estimatedWhy It Matters:
Large portfolio images lack width/height attributes causing layout shifts and unnecessary bandwidth usage.
How to Fix:
Add explicit width and height attributes to all portfolio images to prevent CLS. Resize the 861x1080 cardboard-boxes.webp to match its 508x560 display size. Implement responsive images with srcset for different screen sizes. Consider using CSS aspect-ratio for consistent image containers.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Fix Layout Shift Issues
CLS score of 0.299 indicates significant content jumping, mainly from carousel and banner loading.
Optimize LCP Image Discovery
The LCP image has an 8.3 second resource load delay because it's not discoverable in the initial HTML.
Remove Unused JavaScript Code
2,134 KiB of unused JavaScript is delaying LCP by 7.95 seconds and blocking the main thread.
Optimize Font Loading Strategy
Missing font-display properties cause 35ms of render blocking and potential layout shifts.