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It also left the giant crater seen in this photo and 12 smaller ones spread across the surface.

Because of their popularity, PageSpeed Insights provides specific optimization recommendations.

As a result, optimizing images can often yield some of the largest byte savings and performance improvements: the fewer bytes the browser has to download, the less competition there is for the client's bandwidth and the faster the browser can download and render content on the screen.

Progressive JPEG usually has higher compression ratio than baseline JPEG for large image, and has the benefits of progressively rendering.

jpg 13,501 Bytes convert puzzle.

jpg 4,599 Bytes Feedback Was this page helpful? Use grayscale color space if the image is black and white.

This page was written for version 4 of the PageSpeed Insights API, which is deprecated and will be shut down in May 2019.

In addition, you need to consider whether some images are best served in a vector format, if the desired effects can be achieved via CSS, and how to deliver appropriately scaled assets for each type of device.

GIF and PNG are lossless formats, in that the compression process does not make any visual modification to the images.

png 1,763 Bytes convert cuppa.

For example, you can use to optimize your GIF and PNG images with the following command parameters inside brackets are optional : convert INPUT.

If you have a specific, answerable question about using PageSpeed Insights, ask the question in English on.