Are you using a WebGl based browser? Did you enable WebGl? What are your system specs? Which browser are yo using, and what version is it?
Remember that all of these things will matter.
HTML5 is still in it's infant stages, and having loads of objects (especially if they are high resolution, and NOT power of 2 in size...) will cause poor performance on anything less than a spectacular computer rig.
More information is required.
I looked at your image... looks like a cool circly thing. Not sure again, what I am looking at or what it is supposed to represent.
With more information, perhaps a better and more precise answer can be given.