If your plan for speeding up a slow user HTML/JS interface is to rewrite parts using WebGL, you're severely underestimating the amount of support code you'd nee

If your plan for speeding up a slow user HTML/JS interface is to rewrite parts using WebGL, you're severely underestimating the amount of support code you'd need in order to make that happen. Coming from somebody who has developed and maintains OpenGL user interfaces, you're better off just writing the native app.