DQM and Experience Optimization
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DQM Checkpoints and Standards

Checkpoints - Images between [50 – 200] KB

Larger image file sizes will increase download time. Before using high resolution images, consider the following:

 - Some users will be paying per KB of mobile data that they download.

- There may be multiple images used on a page. 

- Users, in particular the ones that have low bandwidth connections, are not happy to wait for the websites to load their images.

- If images are slow to download, users may miss the message you are trying to put out there.

As large image files can drag the page-load time of your site down and directly affect your rankings on search engines, it is therefore important to resize them before you upload.
 

Affects: SEO, Usability (Large images will slow page download. This reduces user satisfaction, especially on mobile devices.)
Technical Details This checkpoint will scan the image for the image size to see if it between 50 - 200KB, if the image file size is larger than the specified range then it will be reported as an error.
Note that there are other variations of this checkpoint that specifies a different file sizes. The checkpoint will flag images based on the file size specified in the checkpoint.
References: https://searchenginewatch.com/2016/02/16/how-to-optimize-images-for-seo/
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