How to optimize image loading

There are a large number of pictures on a page (large e-commerce website), and the loading is very slow. The following methods can optimize the loading of these pictures and give users a better experience.

1.Lazy loading of images, scroll to the corresponding position before loading the image. (Distance from topYou can add a scroll bar event in the invisible area on the page to determine the distance between the image position and the browserand the page, if the former is smaller than the latter , load first. )

##2. Picture preloading, if it is a slideshow, photo album, etc., the previous and next pictures will be displayed. One will be downloaded first.

3. Use CSSsprite, SVGsprite, Iconfont, Base64 and other technologies, if the image is a css image.

4. If the image is too large, you can use a specially encoded image. When loading, a particularly compressed thumbnail will be loaded first to improve the user experience.

5.If the picture display area is smaller than the actual size of the picture, it will be processed first on the server side according to business needs. Image compression, the size of the compressed image is consistent with the display.

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