Google PageSpeed ​​Insights Optimizing Images Launching New Image Compression?

Question

I had all the images on my site optimized according to Google PageSpeed ​​Insights over the past year +. Google PageSpeed ​​Insights can be found here: https://developers.google.com/speed/pagespeed/insights/

However, I just launched it for my website and noticed that almost all PNG, JPG, JPEG images are now displayed, how to optimize in the "Fix" section. As in the section "Compression can save x KB (x%)".

As usual, they still allow you to upload images in the form of compressed versions that they suggest using, but some of them do not seem to be losslessly compressed and show a loss of quality.

Has Google come up with a new image compression algorithm that will be used for its PageSpeed ​​Insights? If so, then optipng and jpegoptim on Linux are very outdated for any compression algorithm that Google now uses in PageSpeed ​​Insights. Thus, it is not even possible to perform mass compression in the image folder on Linux.

It seems that both large (top 500) sites and small sites were amazed by this, and its sending many sites in red on the PageSpeed ​​Insights page due to the “Optimize Images” offer.

Not sure if this is a Google bug, or what happens when looking at other thoughts about it, as I'm sure other webmasters will notice in the near future.

Answer 1

The same for me, I looked with age to find someone raising a problem, thanks to you, I feel less alone.

It seems that now the images are compared with lossy compression, since when you download the “optimized” version of the images from a page reader and compare with the original image, you may see some loss.

This is not very fair from them, but maybe they are compared with a new algorithm that considers the loss to be almost invisible. It is difficult for us to do the same.

I originally use jpg with 90% quality to create an image, maybe they want less.