Will Cloudflare image optimization features already optimizing images?
Cloudflare’s image optimization features will likely not help much. Because if the site owners are already optimizing their images in some way (Smush.it, etc.). We would strongly recommend not activating two services on top of one another (Smush.it and Cloudflare’s Polish, for example) at the same time. Conflicts may occur if you are running two optimization services at the same time.
Please refer to the following article to know more.
Knowledge Base: How does Cloudflare work?