Search results
- Deferring offscreen images (or lazy-loading) refers to the practice of delaying the loading of images that aren't in your visitors' viewport until they are needed.
gtmetrix.com › defer-offscreen-images
Nov 6, 2023 · What does defer offscreen images mean? To defer offscreen images means to only make the images in the present viewport of the user appear and to delay loading those images that aren’t requested for viewing yet.
People also ask
Why should I defer offscreen images?
How to manually defer images?
Why should you use a deferred image?
How to defer image load?
- Overview
- How Does Deferring Offscreen Images Affect Page Performance?
- How Does GTmetrix Trigger This Audit?
Deferring offscreen images (or lazy-loading) refers to the practice of delaying the loading of images that aren't in your visitors' viewport until they are needed. Generally, when the browser loads a page, it downloads all the images requested, including ones that aren't immediately visible to your visitors (i.e., you will need to scroll down the p...
Images are often the largest resources on your page and require more time to download compared to text-based resources. Loading offscreen images may affect user experience by downloading data that isn't immediately required. Lazy-loading offscreen images ensures that they only load when they are needed, as in appearing into view when your visitor s...
GTmetrix identifies all the offscreen or hidden images that load below-the-fold. Clicking the audit reveals the off-screen images that can be lazy-loaded to improve your page performance. GTmetrix also estimates the potential file size savings for each image file.
Jul 1, 2023 · Learn different ways to Defer Offscreen Images to boost Page Speed Scores. Lazy Loading images can deliver a big boost to Website Performance.
This seems to be pretty clean way of deferring images. The only potential problem is if images carry important information as "Data attributes are a new feature in HTML5". Another option could be to put images to end of body and use CSS to position them. Personally I would stick to javascript.
Code sample
function initDeferImages() {var deferImages = document.querySelectorAll('img[data-src]');deferImages = document.querySelectorAll('[data-src]');forEach(deferImages, swapSrcAttributes('data-src'));}...- What is Lazy Loading? We often associate the word “lazy” with avoiding work as long as possible, or the sheer act of wanting to do nothing at all.
- Why Lazy Load at All? If the user never scrolls to the point of the page that contains the image, then the user will never see that image. It also never loads in the first place because, hey, it was never needed.
- Lazy Loading Techniques for Images. There are two common ways that we load images to a page: the tag and the CSS background-image property.
- Lazy Loading CSS Background Images. A common background image in CSS: .my-class { background-image: url('/path/to/some/image.jpg'); /* more styles */ }
Apr 23, 2024 · To defer offscreen images means to delay the loading of images that are not immediately visible on the screen when the page loads. Defer offscreen images help to load the critical resources above the fold and then load below-the-fold (offscreen) images.
The defer having to do with allowing someone else to decide or choose something, or with agreeing to follow someone else’s decision, tradition, etc., (as in “He deferred to his parents’ wishes”) comes from the Latin verb dēferre, meaning “to bring down, convey, transfer, submit.”
