Show Roku Devs: Roku Whiteboard

I ported node-whiteboard, my node.js/HTML5 Canvas app, to the Roku. It allows you to collaboratively draw using any browser supporting HTML5. A video demo w/ an iPad and Safari can be seen here: http://yfrog.com/jb76977570z . The Roku version uses roImageCanvas for display and long polling to grab all user points from a node.js server. The issue with the Roku version is it's very slow to render. I've posted the code on github in the roku subdirectory: https://github.com/jordanmessina/node-whiteboard

Here's a quick video demo of the Roku version (don't mind my dog):
http://www.youtube.com/watch?v=SOIzC4kPMr4

As you can see, it's somewhat slow to display the points on the Roku. I thought it might have been the url request blocking on the thread and not allowing the canvas to finish rendering, but upon further investigation it doesn't seem to be that. I was hoping to get some advice with a more efficient rendering technique, or even a better Roku object to use that would accomplish the same thing as roImageCanvas. Thanks in advance for any help. Also, fork it and make it your own if you wish 🙂