once we confirm that a few thousand people using this to suck out WP histories won't thrash the servers.
The charts are beautiful. yet I think it would be overdone to generate them on demand for every article. After you've seen a few you've seen them all. They give a general impression of how fluid popular and/or contested articles are, but are too crowded for detailed analysis.
For me a limited set of pregenerated charts for say 50 selected articles, refreshed once a month, would be sufficient.
Erik Zachte