There are things native can do that webapps can't, but the two examples you gave aren't among them. You write custom shaders with webgl, and make use of multipl

There are things native can do that webapps can't, but the two examples you gave aren't among them. You write custom shaders with webgl, and make use of multiple processors with web workers (though they are more analogous to processes than threads, as they don't share state).