I'm testing Cloudimage, a free CDN & optimization tool for images weight. https://www.cloudimage.io
Cloudimage downloads your images from your web server over HTTP / HTTPS or storage provider (Amazon S3, Google Cloud Storage, Azure Blob, ...) resizes them and delivers to your worldwide users rocket fast over CDN.
You can manually prefix image URLs in your HTML code with the Cloudimage URL and use their JS plugin to automatically replace your image URLs.
For non devs, there is also a free Wordpress plugin to automatically accelerate your images on Wordpress: you add your token and Clloudimage takes care of optimization and delivery, using industry best practices and a lightning-fast CDN.