Professional image loading analyzer that visualizes lazy loading strategies and performance issues on any webpage.
Users
313
−16 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
4
0 in 30 days
Store rank
#53K
#44K among extensions
Version
1.0.0
updated 16 Sep 2025
Users
monthly, 13 months
Latest, 15 Oct 2026:313 usersMove the mouse over the chart for any month
Ratings count
monthly, 13 months
Latest, 15 Oct 2026:4 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About Lazy Spy - Image Performance Analyzer
Lazy Spy is the ultimate Chrome extension for web developers and performance engineers who want to optimize image loading on any webpage.
WHAT IT DOES:
- Visually highlights all images with color-coded overlays based on their loading strategy
- Detects 10+ lazy loading libraries (LazySizes, LoZad, React LazyLoad, Vue LazyLoad, etc.)
- Identifies performance issues like missing dimensions, oversized images, and LCP blockers
- Provides actionable optimization recommendations with hover tooltips
KEY FEATURES:
✅ Visual Analysis: Color-coded overlays show lazy loaded (blue), eager loaded (yellow), preloaded (teal), and problematic images (red)
✅ Smart Detection: Automatically identifies native lazy loading, JavaScript libraries, and custom implementations
✅ Performance Insights: LCP detection, fetch priority analysis, CDN identification, and Core Web Vitals impact
✅ Actionable Recommendations: Missing dimensions calculator, format conversion suggestions, preload opportunities
✅ Library Support: Detects LazySizes, LoZad, React LazyLoad, Vue LazyLoad, Intersection Observer, and custom implementations
✅ Export Reports: Generate detailed CSV reports for team analysis
HOW IT WORKS:
1. Click the extension icon on any webpage
2. Toggle on to see instant visual analysis
3. Hover over highlighted images for detailed performance data
4. Get specific recommendations to improve loading performance
Perfect for:
- Web developers optimizing site performance
- Performance engineers auditing image strategies
- Teams implementing Core Web Vitals improvements
- Anyone wanting to understand how images load on websites
No technical setup required - just install and analyze any website instantly!
TECHNICAL HIGHLIGHTS:
- Supports all modern loading strategies (native lazy, JS libraries, custom)
- Real-time performance scoring and metrics
- Framework-specific detection (React, Vue, WordPress)
- CDN optimization analysis (Cloudinary, Imgix, etc.)
- Responsive image and WebP/AVIF format suggestions
Start optimizing your website's image performance today! 🚀
Growth
Window
Users
Change
Ratings
Rating
7 days
−16
−4.9%
0
0.00
30 days
−16
−4.9%
0
0.00
6 months
−47
−13.1%
0
0.00
1 year
+53
+20.4%
+3
0.00
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