Try reading this: https://brendaneich.com/2015/06/from-asm-js-to-webassembly/ https://brendaneich.com/2015/06/from-asm-js-to-webassembly/ "Why: asm.js is great

Try reading this: https://brendaneich.com/2015/06/from-asm-js-to-webassembly/ https://brendaneich.com/2015/06/from-asm-js-to-webassembly/ "Why: asm.js is great, but once engines optimize for it, the parser becomes the hot spot — very hot on mobile devices. Transport compression is required and saves bandwidth, but decompression before parsing hurts."