Quick Reference
Element Code: PE-013
Issue: Images are larger than their display size
Impact: Wasted bandwidth downloading unused pixels
Fix: Serve images at the size they are displayed
Detection: Lighthouse, PageSpeed Insights
What Is This Issue?
Serving a 2000px image that displays at 400px wastes significant bandwidth. Images should be sized appropriately for their display dimensions, with responsive versions for different devices.
Why This Matters for Your Website
Oversized images are one of the most common performance issues. Properly sizing images can reduce page weight dramatically.
How to Fix This Issue
- Resize images: Match display dimensions
- Use srcset: Serve different sizes for different screens
- Consider density: 2x images for retina, 1x for standard
Tools for Detection
- Lighthouse: Calculates wasted bytes from oversized images
TL;DR (The Simple Version)
You are serving images much larger than they display. Resize them to match their actual display size, or use srcset to serve appropriate sizes for different screens.
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