Hi Chuck Lynch,
Hm.. that's really odd. The chart shouldn't be struggling with this much data at all. Did turning off the animations in all charts help? Can you provide some source code to see how you supply the charts with data? We would like to help, but without more info we can't do much more than guess :(.
P.S. We have identified a memory leak in the control released with SP1 release. Have you tried using a recent latest internal build? They generally have better performance than the official one.
the Telerik team