Will hybrid applications benefit from this? In terms of performance.

c-smile · on Nov 1, 2016

If by "hybrid" you mean these two:

    <script type="text/javascript" src="js-code.js"></script> 
    <script type="application/wasm" src="ray-tracer.wasm"></script>

in the same HTML document then "yes" - it conceptually will work faster if instead of ray tracer in JS you will call native function doing that.

As far as I understand the main goal of WASM is to have bytecode that is 1:1 mapable to current CPU architectures. JS source is quite hard to JIT due to typeless nature of JS (as an example of one of problems).

This http://sciter.com/htmlcss-ui-in-medicine/ is an example of such a hybrid application that uses HTML/CSS/script with native code (C++) responsible for low level data processing and filtering. In some cases native code there is generating image fragments for rendering. That application uses http://sciter.com engine where it is possible to mix native code with HTML/CSS/script.