When building a high performant web application, minimizing the number and size of network requests is critical. Network requests are by far the slowest part of loading an application, especially on mobile devices where network connectivity may be more limited.
But what about HTML imports?
The Polymer CLI
Polymer CLI is Polymer’s official command line tool for Polymer. It includes tools for building, optimizing, linting, testing and serving your application.
Install it using NPM:
npm install -g polymer-cli
And then follow the Polymer CLI documentation for building your application.