I tried to generate a "massive" amount of data, but I hit the script CPU usage warning pretty quickly :). Have you tried using Web Workers or perhaps timer-chunking your data generation loop?
If you are generating large sets of data you are better off calling the script from node. Also, if you are using the browser demo it's gonna try to append all that info to the DOM.....
I put this together in less then two days, there is a vast amount of room for improvement in this library. I'd be happy to see a web workers fork and streaming async version in node.