This application makes use of the Canvas feature of HTML 5 and is therefore not yet fully supported by all browsers.
Browser Recommendations:
By far, Chrome and Safari and Opera (in that order) are the absolute best browsers for this page. All three render incredibly fast and display the images with superb clarity.
Internet Explorer works, but renders incredibly slow and pixelates the images. Although the page will function in Internet Explorer, I do not recommend using it.
Firefox works great on small maps, but on a map this large, it does not render correctly. I highly recommend against the use of Firefox at this time. It simply can't run the application properly.