3rd Party graph/meter software?

Does anyone currently use or have any experience with any third party Meter and graphing controls?

We have a copy of ChartFX but the repaint action on it is exceedingly slow.
I'm looking for either some pointers for making the ChartFX meters faster,
or for using something someone else has had success with.

I need updates around 4/second, but even close to that would be nice.

I honestly don't know how they perform, but there are links to NPlot and ZedGraph in my signature, which are both free and 100% managed.