Roxy;
Np. Do you have Node.js installed? I'm hoping for confirmation that it doesn't need to be. OpenScad still renders the .scad files quicker, i presume because the file doesn't to be translated into Java Script first. I'm running a 64 bit machine and i know that for small and rapid changes, i'd find the added delay annoying. You're right about the GUI though. It is more responsive.

This is a good solution for anyone wanting to move from a quirky port of 'C' to a proper and cleaner Oop language.
My 2 cents...

(Edit: Wait! I just realized the the right side of the screen is a text editor. That's gotta help with the speed issue.)