Hi @Georg I have made a new version of this module here Image processing module its much better and easy to modify if need be.
I was a bit cautious about lazysizes in the beginning, but now I use it primarily for the automatic sizes property, and also for “lazyloading” if I need to swap out a placeholder image when the main image has loaded.
Both these functionalities (sizes and lazyload) can be switched independently in the new module. It also has 3 types of placeholder.
e.g. you can use automated sizes, but use native lazyload without lazysizes if you aren’t using placeholders