I'm working with a client with their own dev team, which I'm trying to advise.
According to him media-queries slow down the rendering engine.
thanks a lot in advance for your help
PS: if you know of any resources/stats about rendering engine and performance issues with CSS, I'm interested
If you will use Javascrip, you only need CSS in setting up a configuration for a particular viewport width when downloaded while for media queries, every visitor is need to download the CSS for every width, even if they don't need it. It also create larger CSS files.