GitHub - nextapps-de/winbox: WinBox is a professional HTML5 window manager for the web: lightweight, outstanding performance, no dependencies, fully customizable, open source!
Use Non-Bundled Version Preload Library / Async Load (Recommended) Just add a link tag to the header sections which indicated to preload the script. Right before the body is closing add your site scripts. Depending on your code you may need to load them in the right order.
Source: github.com