You might also like: How Lazy Loading can Optimize Your Shopify Theme Images.Īnd if you want to use progressive JPEGs make sure you understand why you want to use them-because there are downsides to them too. If you’re using an existing theme, taking advantage of the WebP updates in addition to using lazy loading is an ideal way of keeping things fast. So when should I use progressive JPEG vs WebP? Additionally the support for WebP is already pretty good, and Shopify will fallback to a typical JPEG in browsers that don’t support the format, such as Safari or IE. What’s great about this improvement is there are no code changes you need to make as a developer. Reload your page, and you should be able to see that the type is set to webp. To check if your store is rendering WebP, simply open up the developer console in Chrome, and go to the Network tab. Smaller images mean faster download times and less network bandwidth usage, which both contribute to pages appearing noticeably faster. WebP is a modern image format that provides superior compression for images on the web, with an average saving of over 30 percent in file size over traditional file formats like PNG and JPEG. Just last week, Shopify started to automatically serve WebP images. You might also like: How to Manipulate Images with the img_url Filter. Simply pass the format option you want to to the img_url filter and Shopify will let you specify what format you want to render. Using Liquid’s img_url filter, you can pass a format option for images. img_url filter and format option in Liquid So while it does give you a preview faster, the overall time to decode might be close to 2.5 times longer. It’s important to keep in mind that progressive JPEGs take up more CPU time and memory to encode and decode, as the image data is parsed multiple times. Progressive JPEGs are also typically smaller than non-progressive JPEGs, even though the final image is visually the same. Additionally, the layout and space that image takes up on your site is faster to load, making the whole thing feel quicker. Users get a preview of what an image will look like before it’s finished downloading. One clear advantage of progressive JPEGs is that there is a perceived performance bump. You might also like: Using Responsive Images to Decrease Page Loading Times. The main reason why we would use them today is to improve performance for those on slower connections such as mobile or in rural areas. Baseline JPEG loading at 33%, 66%, and 100% Progressive JPEG loading at 33%, 66%, and 100% What’s old is new againįor those who are old enough to remember dial up internet, progressive JPEGs were super popular in the 90’s, especially because we were dealing with slow internet connections. When you see a progressive JPEG load, you’ll see a blurry version of the full image, which over time gets sharper as the image is decoded or renders in the browser. However, a progressive JPEG, is encoded in a different way. This is referred to as a baseline encoding. Traditionally JPEGs are encoded and decoded from top to bottom, left to right. Sign up What is a progressive jpeg?Ī progressive JPEG is an image created using a different encoding process to a typical baseline JPEG. Join for free and access revenue share opportunities, tools to grow your business, and a passionate commerce community. Whether you offer marketing, customization, or web design and development services, the Shopify Partner Program will set you up for success. ![]() Grow your business with the Shopify Partner Program
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