Site AI Audit · Blog · #Image optimization

#Image optimization

Image optimization means delivering pictures in the right format, size and quality so pages load fast without looking worse. Articles tagged here compare formats such as JPEG, PNG, WebP and AVIF. They explain responsive images, compression settings and lazy loading. You will learn why images are often the heaviest part of a page. Each guide shows practical steps for WordPress, shops and hand-built sites. Good image handling is usually the quickest speed win a website can get.

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1. 10. 2026 · Čtení: 8 min

Image CDNs Explained: Automatic Resizing and Modern Formats

An image CDN resizes, compresses and converts images on the fly for each device. Learn how it works, what it costs, and when it…

1. 10. 2026 · Čtení: 8 min

Fetchpriority Explained: Tell the Browser What Matters First

The fetchpriority attribute lets you tell browsers which image or script matters most. Learn when to use high and low, with examples and mistakes…

30. 9. 2026 · Čtení: 8 min

Icon Fonts vs SVG Icons: Which Is Better for Page Speed?

Icon fonts load a whole font for a few icons and can flash or shift on load. See why SVG icons are usually faster…

29. 9. 2026 · Čtení: 8 min

Animated GIFs Slow Your Pages: Replace Them With Video

Animated GIFs are often the heaviest files on a page. Learn why, how to convert them to MP4 or WebM video, and how to…

13. 9. 2026 · Čtení: 7 min

Responsive Images with srcset and sizes: A Practical Guide

srcset and sizes let each device download an image at the right size. Learn how they work, how to write the sizes attribute and…

12. 9. 2026 · Čtení: 7 min

Hero Sliders and Carousels: The Hidden Cost to Page Speed

Homepage sliders look impressive but often delay the main image, add scripts and shift layouts. Learn what they cost and how to replace or…

25. 8. 2026 · Čtení: 7 min

Page Weight: How Heavy Is Too Heavy and How to Trim It

Page weight is the total size of everything a page downloads. Learn what makes pages heavy, how to measure it, sensible targets and how…

12. 8. 2026 · Čtení: 7 min

Lazy Loading Images: When It Helps and When It Hurts

Lazy loading can cut page weight or quietly slow your main content. Learn how native lazy loading works, which images to exclude and how…

10. 8. 2026 · Čtení: 8 min

WebP vs AVIF vs JPEG: Which Image Format Should You Use?

WebP, AVIF and JPEG compared for real websites: file size, quality, browser support, encoding speed and tools, with a simple rule for choosing the…

9. 8. 2026 · Čtení: 7 min