Images on mobile are heavier than expected

In certain situations, the derivative images delivered to mobile devices may be heavier than expected—for example, an image that is larger than the original, even after being processed by Image and Video Manager. To understand why this happened, review the Most Requested Image Widths for Mobile report on the Image and Video Manager Dashboard in ​Akamai Control Center​. Note that desktop traffic and derivative image widths of zero pixels are not included in this report.

Image and Video Manager creates multiple re-sized versions of an original (pristine) image based on your policy settings. Depending on the screen width of the requester's device, Image and Video Manager delivers the derivative image with the width that comes closest to the requested image width. This report makes it possible to directly compare the most requested image widths to the delivered image widths, and provides an analysis of optimal and suboptimal breakpoints.

Most requested image widths for mobile

  • An Optimal delivered image width is within 100 pixels of the original image request.
  • A Near Optimal delivered image width is within 250 pixels of the original image request.
  • An image width is Not Optimal if the width difference between the requesting and delivered image is greater than 250 pixels.

Use this information to adjust your Image and Video Manager policies.