JSDOM instead of Phantom?

[OKNoah]

Admittedly I don't know too much about the differences in JSDOM and PhantomJS. But I see the app runs really slowly. So I made a version that uses JSDOM and it runs a lot faster and doesn't make my Macbook fan kick in. Mine doesn't support most of the options right now cause I just wanted to shoehorn in JSDOM to see if there was a performance improvement or not and there is. Here is the repo:

https://github.com/OKNoah/readable-proxy-jsdom

Is there some reason this uses PhantomJS and not JSDOM?