Suggestions

[aantthony]

Sometimes scrolling in and out of functions can be a little bit confusing as it scrolls in very fast.

Buffer an image which is larger than the current screen size. That way when someone moves the graph, there is a picture to display. (This might slow it down a bit...)

Finally, this might be worth a look over: http://pagespeed.googlelabs.com for slow connections, compression would REALLY help loading time.