Optimize the compression of the images of every theme
Scanning the themes with tools like GTMetrix is easy to see that many images are not optimized in compression. Compressing them would save, in some cases, the 70% of the time for that image and can be done just once.
Speed matters for our customers!
See the screeenshot.
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hyperreview commented
It can also be achieved by external tools which serve the images scaled. I'm tryiing imgix.com