title: angular flex-layout performance
body: <p>I want to build a responsive application with angular 4. I am checking some responsive platforms and of course one of the main options is <a href="https://github.com/angular/flex-layout" rel="nofollow noreferrer">angular flex-layout</a>.</p>
  
  <p>I made some test pages with angular flex-layout and I saw that it doesn't use css media-queries and all the listening and responsiveness are implemented via typescript.</p>
  
  <p>Could this fact cause a performance problem in mobile devices/low resources devices?
  There are more responsiveness frameworks such as <a href="https://www.npmjs.com/package/flexboxgrid" rel="nofollow noreferrer">flexbox-grid</a> which are css based only. wouldn't it be better to use css-based platforms rather than angular flex-layout from performance point of view? </p>