Big, unoptimised images are the most common reason websites load slowly. A single photo straight from a phone camera can be several megabytes — enough to make a page crawl on mobile data.
Why it matters
- Speed — images are usually the heaviest part of a page.
- SEO — Google ranks fast sites higher.
- Bounce — slow pages lose visitors before they even load.
The three things that matter
1. Right size (dimensions). Don’t upload a 4000px photo to display at 800px. Resize it to the size it’s actually shown.
2. Right format.
- WebP — best for most photos (small and sharp).
- JPEG — fine for photos.
- PNG — for logos and graphics with transparency.
- SVG — for icons and logos (scales perfectly, tiny).
3. Compression. Run images through a compressor to cut file size — often 70% smaller with no visible quality loss.
A quick win
“Lazy loading” makes images load only as the visitor scrolls to them, so the top of the page appears instantly.
The takeaway
Optimising images is the single biggest speed win for most websites. At Vystra we size, convert and compress every image automatically — so your site stays fast and still looks crisp.