LCP
Largest Contentful Paint
3.2s
Needs Improvement
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Optimize Critical Resource Loading
How to optimize shutoffware.com
Optimize Critical Resource Loading
High Impact+6 points estimated
Why It Matters
Your main JavaScript bundle creates a 63ms dependency chain that blocks initial page rendering.
How to Fix
Split your main bundle into critical and non-critical chunks using dynamic imports. Preload the critical JavaScript file with <link rel='preload'>. Move non-essential features to load after initial paint using requestIdleCallback or intersection observer.
0Needs Improvement
What This Score Means
A score of 88 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
18ms
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 has good performance with a score of 88/100, but there's significant room for improvement in loading speed. The biggest issue is excessive unused JavaScript (145 KiB of waste), particularly from Firebase and React vendor files, which is slowing down both the first content display (3.0 seconds) and largest element loading (3.2 seconds). Additionally, 95% of the CSS file (14 KiB) is unused and could be removed. Cleaning up this unused code could easily boost the performance score into the excellent range and make the site feel noticeably faster for users.
Other Optimization Recommendations
Remove Unused JavaScript Code
High Impact+8 points estimatedWhy It Matters:
Unused JavaScript is costing 145 KiB and delaying both FCP by 300ms and LCP by 150ms.
How to Fix:
Analyze your bundle with webpack-bundle-analyzer to identify unused Firebase and React code. Use tree-shaking to eliminate dead code and consider code splitting to load only required modules. Move non-critical vendor libraries to lazy-loaded chunks.
Eliminate Unused CSS Rules
Medium Impact+4 points estimatedWhy It Matters:
95% of your CSS bundle is unused, wasting 14 KiB of network resources unnecessarily.
How to Fix:
Use PurgeCSS or UnCSS to remove unused styles from your production build. Extract critical above-the-fold CSS inline and defer the rest using media='print' then switching to media='all' onload. Consider CSS-in-JS for component-scoped styles.
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.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Purge Unused CSS Rules
95% of your CSS file is unused, wasting 14KB of network bandwidth and blocking rendering.
Optimize Critical Request Chain
Your longest network chain takes 320ms through 4 levels of dependencies, delaying page rendering.
Optimize Network Request Chain
Your critical resource chain spans 4 levels deep, creating unnecessary delays in content rendering.
Reduce Network Chain Dependencies
Long dependency chains create waterfall loading that extends total page load time to over 20 seconds.