A low-quality image has a considerably smaller file size due to the low quality and high compression rate, so this image will be loaded very fast. This is where progressive images come into play.īasically, having a progressive image means that a low-quality image will be displayed to the user until a high-quality image has finished loading. On slow connections, downloading images can take ages. Most notable JavaScript-based solutions, in my opinion, are:Īlthough lazy loading does a great job performance-wise, looking at the problem from UX perspective we can see that the user is waiting for the image to load and looking at the blank space. Native Lazy Loading JavaScript-based solutions Other images are not loaded until they appear within the user's viewport.Īlthough native Lazy loading has just been recently introduced to browsers, there have been many JavaScript-based solutions available. In our case, only images that are currently within the user's viewport (screen) are loaded. Lazy loading is a concept of only loading assets that are needed. Although optimizing image file reduces the file size of images considerably, having multiple optimized images (on the webshop catalog page for example) loaded all at once can have a poor effect on performance. We've looked at the image optimization strategies that reduce the file size by compressing the image without changing the image resolution and affecting image quality too much. Most notable plugin, in my opinion, is imagemin which can be easily integrated with any CLI or build tools: Images can be optimized as soon as they are added to the project. Image optimization plugins can be easily added to those build configs and fully automate the image optimization process.
![optimize images for web online optimize images for web online](https://seriesestreno.com/wp-content/uploads/2021/08/riq4xVG3FflKAB7JlIQPs9bkFw5.jpg)
On complex projects, it's common to use an equally complex build system like Gulp, Webpack, Parcel, etc. Also, there is a risk that some images may end up not optimized due to human error or some other factor. However, if you are working on more complex projects with multiple people and using a lot of images, optimizing each one as it is added to the project can become tedious.
![optimize images for web online optimize images for web online](https://affibest.com/wp-content/uploads/2020/09/Website-Optimization.jpg)
Depending on the resolution and image quality, you might end up with images that take up more than 70% of your total website size. Unoptimized (non-minified) images are one of the main causes of poor website performance, mainly on the initial (first) load. Optimization for higher pixel density screens.