LCP
Largest Contentful Paint
4.3s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Eliminate Unused JavaScript Code
How to optimize pwa.opusapp.eu
Eliminate Unused JavaScript Code
High Impact+18 points estimated
Why It Matters
Unused JavaScript wastes 441 KiB and delays LCP by 2.25 seconds, significantly impacting user experience.
How to Fix
Implement code splitting using dynamic imports for your main bundle (253KB unused). Move chart library to lazy-load only when needed. Use tree-shaking to remove dead code from Sentry bundle. Consider switching to a lighter error tracking solution if full Sentry features aren't needed.
0Needs Improvement
What This Score Means
A score of 73 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
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 web application has moderate performance issues with a score of 73/100, but users are experiencing frustratingly slow loading times. The biggest problem is excessive unused JavaScript code, which is wasting 441 KB and delaying both First Contentful Paint (4.2s) and Largest Contentful Paint (4.3s) by over 2 seconds. The site is loading nearly three times more JavaScript than it actually uses, with the main application file being 91% unused code. Removing or deferring this unused JavaScript, along with addressing render-blocking CSS issues, could dramatically improve loading speed and push the performance score well into the green zone.
Other Optimization Recommendations
Fix Render Blocking CSS
High Impact+12 points estimatedWhy It Matters:
Critical CSS blocks initial render and delays LCP by 450ms, preventing users from seeing content quickly.
How to Fix:
Extract critical above-the-fold CSS and inline it in the HTML head. Load the remaining CSS asynchronously using media='print' onload='this.media="all"' technique. Remove 87% of unused CSS rules from your main stylesheet to reduce bundle size from 24KB.
Optimize Sentry Integration Performance
Medium Impact+8 points estimatedWhy It Matters:
Sentry library causes 29ms of forced reflows, blocking the main thread and degrading user interactions.
How to Fix:
Move Sentry initialization to after page load using requestIdleCallback. Reduce sampling rate in production to minimize performance overhead. Consider lazy-loading Sentry only when errors occur or use a lighter error tracking solution.
Keep Your Site Fast After Optimization
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Optimize Sentry Integration Performance
Sentry library causes 29ms of forced reflows, blocking the main thread and degrading user interactions.
Fix Render Blocking CSS
Critical CSS blocks initial render and delays LCP by 450ms, preventing users from seeing content quickly.
Optimize Image Delivery and Sizing
Images are 177KB larger than needed due to oversized dimensions and poor compression, slowing LCP by 1.3 seconds.
Eliminate Render-Blocking Resources
CSS files are blocking initial page render for 3.9 seconds, preventing users from seeing content.