Bad results

Hello, I am testing your plugin the free edition, the results are not good at all and I wonder if something I am doing wrong.

Mention that I am using W3 total cache, super cache from siteground and also cloudflare.

Why the results are not good?
1. PageSpeed Insights, find almost all my images(17) that need optimize (Should Fix!).
Total results: “Optimize the following images to reduce their size by 644.9KiB (94% reduction).”
2. gtmetrix, Serve scaled images is zero (0) which also find a lot of images(17).
One example: “example.png is resized in HTML or CSS from 1024×680 to 203×135. Serving a scaled image could save 97.3KiB (96% reduction).”

Any ideas before move to test some other plugin would be very helpful,

Thanks in advance.