Hi Ivandelajara,
My apologies for the late reply. We do not provide support on this forum anymore. For future questions, please visit the Github forum:
https://github.com/optimalisatie/above-the-fold-optimization/issues
Thank you for the suggestion!
Javascript concatenation, minification and optimization will be part of our new plugin that should be available by July 2017. It will contain unique solutions to achieve the best possible performance and it will enable Google Closure Compiler based javascript optimization:
https://developers.google.com/closure/compiler/
The result of Google Closure Compiler is not just a smaller size than UglifyJS (and far better than any PHP based solution such as Autoptimize) but also improved Javascript speed (code optimization), which is unique for WordPress.
We will also include a unique javascript loader innovation based on HTML5 Fetch Stream API (with AJAX / XHR stream fallback for old browsers) that will enable per file javascript loading with a single download stream (1 fast / optimized request for all javascript data while files are executed as soon as the data for a file has been transferred), combined with localStorage cache to save requests/increase speed for returning users and during navigation. It will enable the best possible javascript loading and render performance in all situations (for first, returning and navigation requests). It is a unique solution, it has never been done before.
The javascript loader and compressor will contain a javascript source map that allows for debugging of the original files, as if the files were loaded as originally configured by WordPress.
https://www.html5rocks.com/en/tutorials/developertools/sourcemaps/
To receive an update when the plugin is ready, you could watch the Above The Fold Optimization plugin on Github.
https://github.com/optimalisatie/above-the-fold-optimization
