Any idea on how to deal with downsampling from graphite? IE don't send such high resolution to the browser because it can quickly cripple older machines. Now I

Any idea on how to deal with downsampling from graphite? IE don't send such high resolution to the browser because it can quickly cripple older machines. Now I know that with graphite I can specify different granularity but I don't know if there is an easy way to switch between them when looking at a day vs a week of events.