GTMetrix and PageSpeed Insights complain about some images, why is that?

If GTmetrix, PageSpeed Insights or other web speed checkers are complaining about one or more images on your website after you ran the ShortPixel Image Optimization tool, here are some common reasons why this is happening:

  1. The image was optimized but it is not properly sized for its placeholder.
    That happens when, for example, a 400x400px image is used for a 100x100px placeholder. It makes no sense to attempt to optimize the image more; you just need to resize it.
    As possible solutions, you can resize the image on your WordPress admin area or use the appropriately sized thumbnail. Or you can try our Adaptive Images plugin, which was specifically designed for such cases.

    GTmetrix and PageSpeed Insights show this as "Properly size images".
  2. The image was optimized but it still retains its EXIF data.
    Some speed testing websites will complain about an image not being optimized enough because they usually remove the EXIF data (which can take up to 8% of the image size). If you choose to keep the EXIF data on ShortPixel's settings, then you can safely ignore this message.
  3. The image was optimized and it still retains its color profile.
    Speed testing websites will generally remove the color profile data from images. ShortPixel chooses to keep this data as otherwise the image's colors may look altered on different browsers. You can safely ignore this kind of warnings as well.
  4. The image has not been optimized yet.
    It is possible that a specific image was not able to be optimized for some reason during the bulk optimization. To check this, simply go to your Media Library, and check if the image was optimized.
  5. The speed tester is seeing an old version of your images.
    Also known as "cache", sometimes the speed tester still see the old versions of your images. Make sure to clear the cache of your WordPress website, and then try again.
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