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answers:

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We're trying to show 4 trend graphs and will be adding data to them them at a rate of about 1 point every second. In the end each trend needs to show around 600 points.

Currently we are using the graphing tools from Syncfusion but they are unable to redraw the graphs at the speed we require. I believe the issue is due to the fact that we're using a 'graphing' tool not a 'trending' tool, so its redrawing the entire line every refresh.

The application is running on a beast of a box: Dell 2950 with: dual processors(Intel Xeon's) with quad cores, 2.99GHZ, and 8gig's of ram.

Do you know where we can get a high speed trending control? WPF controls preferred.

A: 

I am not sure how well it will fit your needs, but you might take a look at http://www.visifire.com/
Visifire is an open source graphing control for Silverlight and WPF.

Totty
Trending is a different task to graphing. Graphing is non real time display of data in a graphical format. Trending is real time display of data against time. In addition Trending tools allow zoom of data and timespan ranges
Peter M
As you can see from the example in the top right corner on http://www.visifire.com/silverlight_charts_gallery.php , Visifire now features real-time updating.
Totty
@Totty .. I saw their claim of "Now with real time updates", but when I went through their demo video of chart types I saw nothing that showed that functionality or anything that indicated their product wasn't just data graphing. So I would be skeptical of using it as a Trending tool
Peter M
(continued) I have also gone through their 2.x documentation and nothing jumps out as it being a Trending tool
Peter M
+1  A: 

Look no further, use visifire.

Big Boss
We ended up implementing ChartFX's WPF trend control. At the time Visifire's trend seemed so-so. However now it looks better and is WAY cheaper in a corporate setting.
dilbert789
A: 

@Peter Are there good trending controls for the .net environnement?

grtz

Tjs
Several are mentioned already in the answers: Visifire now does trending, and there others like chartfx that have trending.
dilbert789