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I've run a GTmetrix test on my website.

I get one issue in its audit report at https://gtmetrix.com/reports/www.datanumen.com/3FtNGzq8/

audit report

I check the image with Chrome DevTools, as below:

chrome devtools

Since the test is for Desktop, the image size is 649 x 508 and it is served as 649 x 508.

Also I found that there is a srcset tag in the code for the different resolutions, which is also recommended in https://gtmetrix.com/blog/how-to-properly-size-images/. So I cannot find the problem with the image, why does GTmetrix report it as an issue?

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1 Answer 1

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GTmetrics is probably trying to tell you that you can further compress/optimize your image. By running it through a tool such as TinyPNG, or OptiPNG as recommended by the GTmetrix page on optimizing images, you can further reduce the image's size without much perceptual loss.

4.4KB is a negligible amount of potential savings, though. It probably makes sense to ignore it unless you have many images like this on the same page.

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