Lazy Load & Network Simulator

The UX Performance Guide: Lazy Loading & Network Simulation

The Adiminium Lazy Load Tester is a critical tool for developers and UX designers. We all test our websites on fast office Wi-Fi, but real users often browse on spotty 3G/4G connections. This tool simulates those harsh conditions, allowing you to perfect the "Loading State" of your images.

Why Test "Loading States"?

A blank screen is the enemy of user retention. If your image takes 3 seconds to load, what does the user see during those 3 seconds?

• The Generic Spinner: Better than nothing, but can feel broken if it spins too long.
• Skeleton Screens: A gray pulsing box that mimics the shape of the content. This is the gold standard (used by Facebook, LinkedIn, YouTube) because it lowers "Perceived Latency".
• Blur-Up (LQIP): Loading a tiny 10px blurry version first, then fading in the high-res one. (Used by Medium, Next.js).

Understanding "Network Throttling"

Browsers have built-in dev tools for this, but they are buried in menus. This tool brings network simulation to the forefront.

• Fast 3G (1.5s delay): Good for testing basic patience.
• Slow 3G (3s delay): Good for testing error states and timeout messages.
• Offline (Infinity): What happens if the image never loads? Do you have an `alt` tag fallback?

Step-by-Step Guide

1. Set the Delay: Drag the slider to 2000ms (2 seconds).
2. Choose Image: Select a high-res photo.
3. Observe: Watch the "Spinner" animation. Does it look good? Is it centered?
4. Test Failure: Try a broken URL to see if your browser renders the "broken image" icon or your custom error styling.

Frequently Asked Questions