Themes and plugins usually has a few CSS/JS files which contains a lot of rules and functionalities. In most cases you won’t need the whole file on each pages. With overwriting resources you can remove unused bytes from CSS and JS files.
Overwrite rules can be added in live editor. Once you create an overwrite rule, Shifty will clone the selected resource, so you can make modifications without affecting the original file. You can also restore the original version of the file with a single click.
For easier editing you can beautify minified files, and also can minify them using WP Shifty API.
