The Ultimate Chrome Extension for Image Performance Analysis

Visually analyze image loading strategies on any webpage with color-coded overlays. Detect lazy loading libraries, identify performance issues, and get actionable optimization recommendations.

Extension Icon Install Extension Watch Demo
10+ Lazy Loading Libraries
100% Visual Analysis
0 Setup Required
Lazy Spy in Action

What Lazy Spy Does

Comprehensive image performance analysis with actionable insights

Visual Analysis

Visual Analysis

Color-coded overlays show lazy loaded (blue), eager loaded (yellow), preloaded (teal), and problematic images (red)

Smart Detection

Smart Detection

Automatically identifies native lazy loading, JavaScript libraries, and custom implementations

Performance Insights

Performance Insights

LCP detection, fetch priority analysis, CDN identification, and Core Web Vitals impact

Actionable Recommendations

Actionable Recommendations

Missing dimensions calculator, format conversion suggestions, preload opportunities

Library Support

Library Support

Detects LazySizes, LoZad, React LazyLoad, Vue LazyLoad, Intersection Observer, and custom implementations

Export Reports

Export Reports

Generate detailed CSV reports for team analysis and performance tracking

How It Works

Get started in seconds with our simple 4-step process

1

Install Extension

Add Lazy Spy to Chrome with one click from the Chrome Web Store

2

Click Icon

Navigate to any webpage and click the Lazy Spy extension icon

3

Toggle Analysis

Toggle on to see instant visual analysis with color-coded overlays

4

Get Insights

Hover over highlighted images for detailed performance data and recommendations

See Lazy Spy in Action

Visual analysis that makes image performance optimization crystal clear

Lazy Spy Analysis View

Visual Analysis

Color-coded overlays show loading strategies at a glance

Performance Insights

Performance Insights

Detailed metrics and optimization recommendations

Library Detection

Library Detection

Identify which lazy loading libraries are being used

Technical Highlights

Built for modern web development with cutting-edge performance analysis

🚀

All Modern Loading Strategies

Supports native lazy, JS libraries, and custom implementations

📊

Real-time Performance Scoring

Instant metrics and Core Web Vitals impact analysis

⚛️

Framework-specific Detection

Specialized analysis for React, Vue, WordPress, and more

☁️

CDN Optimization Analysis

Cloudinary, Imgix, and other CDN performance insights

🖼️

Responsive Image Suggestions

WebP/AVIF format recommendations and responsive optimization

🔧

Zero Configuration

Works instantly on any website without setup or configuration

Perfect For

Whether you're a developer, engineer, or performance enthusiast

👨‍💻

Web Developers

Optimize site performance and implement best practices for image loading

⚡

Performance Engineers

Audit image strategies and improve Core Web Vitals scores

👥

Development Teams

Implement Core Web Vitals improvements with actionable insights

🎯

Performance Enthusiasts

Understand how images load on websites and identify optimization opportunities

FROM THE CREATOR, JEFF LOUELLA

Hi, I'm Jeff Louella, an independent software developer passionate about creating tools that make complex data accessible and actionable. Lazy Spy was born from my desire to bring more transparency and analytical power to the everyday web performance workflow and for professionals needing deeper image optimization insights.

Lazy Spy is a free tool, and I'm committed to keeping its core features accessible to everyone. If you find Lazy Spy valuable and would like to support its continued development, maintenance, and future enhancements, please consider:

Learn more about my other projects at jefflouella.com

SUPPORT LAZY SPY

Support My Work on Buy Me A Coffee

LEAVE A REVIEW

Leave a positive review on the Chrome Web Store.

More Tools from Jeff Louella

Explore my other Chrome extensions designed to enhance your workflow

Quick Click Website Audit

Transform your SEO workflow with one-click access to 25+ professional tools. Analyze any website instantly with comprehensive on-page analysis and real-time scoring.

Try Quick Click SEO

GShop Lens

Master Google Shopping SERPs with AI-powered insights, pricing analysis, and competitive intelligence. Perfect for e-commerce managers and marketers.

Try GShop Lens

Title Tune

Unleash AI-powered title perfection! Craft click-worthy, SEO-optimized page titles using live SERP analysis and multiple AI models (GPT, Claude, Gemini).

Try Title Tune

Start Optimizing Your Website's Image Performance Today!

Join thousands of developers who are already using Lazy Spy to improve their website performance. No technical setup required - just install and analyze any website instantly!

Extension Icon Install Extension