Most single page javascript apps that don't prerender are the biggest sinners in a multitude of ways. 1) with the amd loading system you spawn multitude http requests, where 2) none of the code went through a tree shaking to remove dead code (ala the closure compiler in advanced mode - or something which cross compiles) you download a whole steaming heap you don't need thus extra bytes 3) no pre-rendering, so now you are blocking the users experience till your whole steaming pile has managed to trickle down onto a mobile device, the joy