Performance
7 min read
April 10, 2025

Why Your Website's Images Are Killing Your Page Speed

The average webpage is 2.5MB. Images are half of that.

Why Your Website's Images Are Killing Your Page Speed

HTTP Archive data: median webpage = 2.5MB, images = ~50% of that. E-commerce sites regularly ship 8–15MB of images per product page.

Google's research: 1-second mobile delay reduces conversions 20%. 53% of mobile users abandon pages taking 3+ seconds.

The Fix Checklist

  • Convert to WebP — 25–35% smaller, 97%+ browser support
  • Compress properly — photos at 75–85% quality; hero images under 200KB
  • Resize correctly — don't serve 3000px images in 400px thumbnails
  • Lazy loading — loading="lazy" on all below-fold images
  • Prioritise LCP — fetchpriority="high" on hero image
  • Use a CDN — Cloudflare free tier covers most small-medium sites

    • Before / After Example

    A Pakistani news site after one afternoon of optimisation:

    MetricBeforeAfter
    Image weight8.4 MB1.2 MB
    LCP9.2s2.4s
    PageSpeed mobile1874
    Bounce rate68%51%

    Use our Image Compressor and WebP Converter.

    Written by the GMC Tools team

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