This approach is hassle-free - and yet the most precise one. Use TwicPics for hands-free and pixel-perfect optimization of responsive images. This complexity might increase exponentially as you also need to comply with the other best practices (conditional delivery in next-gen formats, etc), and art direction.īelow we will propose an approach that sets the developers free from this error-prone and time-consuming task. The more variants you specify, the more efficient the responsive image optimization would be - but this comes at a cost of additional complexity. This optimization technique is described here. Such native responsive images are best for images above the fold (so-called "critical images"). You could use the srcset and sizes attributes of the tag to let the browser choose the most appropriate version of the responsive image to load. There are multiple ways to implement such responsive image optimization. Your goal is to make the intrinsic size of the image version to be loaded as close as possible to the rendered size, corrected for the DPR. Ideally, you’d need to prepare for the modern diversity of screens with the resolution ranging from 320px to 4K, as well as varying density pixel ratios. The solution to the “properly size images” problem lies in serving differently sized versions of the image for mobiles, tablets, and desktops. More generally, the “Properly size images” warning is issued each time Google Lighthouse detects a discrepancy between the maximum recommended and the intrinsic sizes of the image of over 4%. The audit reports the culprit image weight as 421.3 KiB, out of which at least 317.6 KiB could be saved by serving an adequately-sized version to the mobile devices. Other things being equal, this difference in pixel count makes the larger image 3.1 times heavier. This 1904 x 1904 pixels intrinsic size of the category image is way larger than the maximum recommended size of 1080 x 1080 pixels.
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