What should I make of this ?
Don't use it is my highest recommendations. Or Minify either..
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@piotr: I move the plugins CSS's codes into my custom.css and remove the css files from the plugin folders. That lowers the number of CSS file requests. Just check if you don't break anything layoutwise.
My experience with touching JS compression in Vanilla is, that it breaks your site. Haven't found a smart way yet in Vanilla. Though in every other software i use.