LCP
Largest Contentful Paint
19.2s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Reduce Unused JavaScript Payload
How to optimize shop.boeing.com
Reduce Unused JavaScript Payload
High Impact+20 points estimated
Why It Matters
226KB of unused JavaScript is wasted bandwidth that delays LCP by 1.4 seconds and increases loading costs.
How to Fix
Implement code splitting to load only necessary JavaScript chunks per page. Remove unused portions of Google Tag Manager (97KB unused) and Cookie Law SDK (68KB unused). Use dynamic imports for non-critical features like analytics and tracking scripts.
0Needs Improvement
What This Score Means
A score of 51 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
233ms
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 Boeing e-commerce site has poor performance with a score of 51/100, indicating significant user experience issues. The biggest problem is excessive JavaScript that's blocking the page from loading quickly - the site takes 7.4 seconds just to show the first content and a staggering 19.2 seconds to become fully interactive. The main culprits are oversized JavaScript files (over 3MB total), render-blocking resources that prevent the page from displaying, and inefficient caching that forces users to re-download the same files repeatedly. Reducing JavaScript bundle sizes, eliminating render-blocking resources, and implementing proper browser caching could dramatically improve load times and potentially boost the performance score by 30+ points.
Other Optimization Recommendations
Eliminate Render-Blocking CSS Resources
High Impact+25 points estimatedWhy It Matters:
Critical CSS is blocking page rendering for 2,040ms, severely delaying both LCP and FCP by over 2 seconds.
How to Fix:
Extract critical above-the-fold CSS and inline it in the HTML head. Load the remaining CSS asynchronously using rel='preload' with onload handler. Minify the 159KB styles-DQY3Y7NI.css file to reduce its 14% bloat.
Optimize Main Thread Processing
Medium Impact+12 points estimatedWhy It Matters:
JavaScript execution blocks the main thread for 2.5 seconds, creating 300ms of Total Blocking Time that prevents user interactions.
How to Fix:
Break up long-running tasks by using setTimeout or requestIdleCallback for non-critical operations. Defer third-party scripts like Dynatrace monitoring until after page load. Optimize the 1.2 seconds spent in script evaluation by removing unnecessary polyfills for modern browsers.
Keep Your Site Fast After Optimization
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Optimize Main Thread Processing
JavaScript execution blocks the main thread for 2.5 seconds, creating 300ms of Total Blocking Time that prevents user interactions.
Eliminate Render-Blocking CSS Resources
Critical CSS is blocking page rendering for 2,040ms, severely delaying both LCP and FCP by over 2 seconds.
Minify CSS Files
Unminified CSS wastes 2.5 KiB of network payload, adding unnecessary bytes to your critical rendering path.
Extend Cache Lifetimes
Short cache lifetimes force unnecessary re-downloads of static assets, slowing repeat visits and wasting 69 KiB of bandwidth.