CodexBloom - Programming Q&A Platform

Next.js Image Component Ignoring `sizes` Attribute Leading to Unoptimized Loading on Large Screens

👀 Views: 2 đŸ’Ŧ Answers: 1 📅 Created: 2025-06-08
next.js image-optimization responsive-design javascript

Quick question that's been bugging me - I've encountered a strange issue with I've searched everywhere and can't find a clear answer... I'm relatively new to this, so bear with me. I'm working with an scenario with the Next.js Image component where the `sizes` attribute doesn't seem to be respected when rendering on larger screens. I've set the `sizes` attribute to optimize image loading based on screen size, but it appears that the image is always loading at the largest possible size, which is negatively impacting performance. For example, I'm using the following code: ```jsx import Image from 'next/image'; const MyComponent = () => { return ( <Image src='/images/my-image.jpg' alt='My Image' layout='responsive' width={1200} height={800} sizes='(max-width: 768px) 50vw, (max-width: 1200px) 33vw, 25vw' /> ); }; ``` In the above example, I expected that on larger screens (greater than 1200px), the image would load at 25% of the viewport width, but the Network tab in Chrome's DevTools shows that it's fetching the full 1200px width image regardless. I've tried clearing the cache, running `next build` and `next start`, and even switching the layout option to `'intrinsic'`, but the behavior remains the same. Additionally, I checked the console for any warnings, and there are none. I'm using Next.js version 12.2.0. Is there an additional configuration or workaround that I might have missed to ensure that the `sizes` attribute is properly utilized for image optimization? My development environment is Linux. Thanks in advance! My development environment is Windows. I've been using Javascript for about a year now. Thanks in advance! My development environment is Debian. Cheers for any assistance!