By the time you have a working C++ implementation, for all you know v8 and SpiderMonkey's optimizers will be generating code just as fast as your C++.
I dont think that's going to happen anytime soon.
But I agree that JavaScript is the way to go with this.
The prize is not that high to justify such a steep adoption curve. I mean "make A as wide as B is high" can be accomplished in javascript today.
The goals of the project are way beyond just making "A as wide as B is high". That is just a drop in the ocean. Once we do effects (such as shadows, blur, noise, etc) and more advanced processing we'll need as much performance as we can.
The people that I usually see getting wowed are web designers and devs, that know the pains of dealing with all those issues that this project is trying to solve. I don't know your background, but if you don't do CSS you probably don't know or care about all the troubles that one has to go through to get your site working correctly across all browsers, laying out your page (most apparent in fluid designs, or with dynamic content from a database), etc.
And again, we would love to hear about how we can market ourselves better, we are all ears!
I dont think that's going to happen anytime soon.
But I agree that JavaScript is the way to go with this. The prize is not that high to justify such a steep adoption curve. I mean "make A as wide as B is high" can be accomplished in javascript today.