Tubalmartin/riloadr. BoxJS - A simple package management service. Spin.js. JSL JavaScript Loader - Andres Vidal. Imagine there's a 4-lane highway between your web browser and the internet itself. This highway is optimize to let pictures, text, and css fly by. But, when it comes to external scripts, the highway creates a toll booth that slows traffic. The worst part is that pictures text, and css caught behind these scripts have to wait until they pass through.