Hello, @kcwebguy,
Thank you for reaching out and taking the time to test our plugin!!
First of all Gtmetrix might not be able to even detect that the plugin is working because it is intentionally functioning as unobtrusively and transparently as possible. This means that Gtmetrix is analysing your website contents but it is not running your website in an actual device with an actual browser. So, when our plugin sees requests coming from such a test it appears to it that a random desktop machine is requesting images and, therefore, does not try to resize them.
Instead, I would recommend a tool like https://webpagetest.org/ and a test with an actual mobile device, if you want to get real metrics.
However, it is relatively easy to test the plugin with your own browser, as it is explained in the “How to test” section of the plugin page here https://www.ads-software.com/plugins/adaptive-images/.
Lastly, when the plugin actually works as designed, it only resizes images if an when they are requested by smaller devices. So, until then, the cache can remain empty and, even when it is populated, only the requested images will be added to it (and kept for later usage, of course). And, if an image is small enough for the requesting devices, then it might not need to be ever resized at all!
At the moment, I see that you have opted for another image resizing solution (Optimole) which uses its own CDN to deliver images. Even if our plugin is active it cannot function at the same time with such a CDN. If you would like me to give it a test you would need to leave only our plugin active and no image CDN solution. Which was our intention to begin with, that is to provide a self hosted, no cost, image resizing solution.
Hope this helps!
Let me know if I can help any further.
Cheers,
Takis
