Image optimization
Make image-heavy pages feel fast.
A fast page starts with the right image—not the smallest file. We choose the format, dimensions, loading behaviour, and delivery path that fit each screen.
Start with one slow page. We will show what to change and why.
The page-speed problem
Keep the detail buyers need.
A furniture shop may display a chair photograph in a small product grid and again in a larger detail view. The grid needs a clear shape and colour; the detail view needs enough resolution to inspect the fabric and seams. Sending the original camera file for both can waste data.
Find the images that matter
Open the product page on a phone. Note which photograph appears first, which images load only after scrolling, and whether the main image leaves the buyer waiting.
Match the image to its job
Prepare sizes for the product grid and detail view. Keep a larger source for an actual zoom feature, rather than making every visitor download it immediately.
Check the page after the change
Compare the fabric, seams and colour at the sizes customers use. Then reload the same page under the same test conditions to check the loading change.
Four practical checks
Check format, size, loading and detail.
Formats
Compare candidate formats using the same photograph and display size. Choose a smaller file only if the fabric, edges and colour still look right in the browsers you support.
Sizes
Provide suitable image sizes for the layout and screen density. A 400 CSS-pixel image may need an 800-pixel source on a 2× screen. See web.dev’s responsive-image explanation.
Loading
Let the main visible product image load promptly. Defer images farther down the page, and reserve their space so text and buttons do not jump. See web.dev’s image-loading guidance.
Quality
Check the product thumbnail, full view and any zoom view separately. Compression that looks acceptable in the grid may blur a close-up.
If you only need to send a large file, use Devenia Send.
Before and after
Check what changed on the page.
Downloaded file
Record the image file and bytes downloaded at the same viewport before and after. A smaller source file helps only if the page actually serves it.
Visible detail
Compare the same crop at the same display size. Check the details that affect the purchase, such as fabric texture and stitching.
Loading and movement
Repeat the page test under matching conditions. Check when the main image appears and whether its arrival moves the price or purchase button.
Image optimization for your site
We make the images your customers see load faster.
Send one slow page and identify the image detail your customers need to see. Include the device where it feels slow and whether the problem affects the first image, gallery or zoom view.