Optimizing 3D Collections in WPF

re: Optimizing 3D Collections in WPF

GreenReaper — Fri, 01 Sep 2006 02:55:44 GMT

Thank you, Tim! With your advice about detaching objects from I was able to make significant gains with just twelve extra lines of code.

We have an application in testing that has an arbitrary number of visuals on screen, parented to a container visual. Every one of those child visuals is moved every frame. The update pattern is such that it invalidates the whole of the screen.

I added in the necessary code to detach the container visual from the visual tree while I was moving its children and then add it back later, and timed the results:

At 150 visuals there is no obvious difference in performance - both are just under 50% CPU
At 300 it's possible to discern that there's an increase in CPU to 70% for the non-detaching version, and it pauses for a frame or so every so often. The non-detaching version is still at 50% CPU and looking great.
At 500 there is a visible difference - the detaching version is now at 65% CPU but still pretty smooth. The non-detaching version is visibly struggling, down to 15FPS, and is using up 70% CPU.
At 1000, the detaching version is about where the other one was at 500, or maybe a little better - dragging windows is definitely choppy, though you could still use the system. The non-detaching version is at 85% and 8FPS.

This may have made the difference between a feasible and infeasible design.

You Feedback and Performance Analysis

Pablo Fernicola's Personal Blog — Fri, 01 Sep 2006 06:43:03 GMT

One member of the WPF community sent me and the Performance team a very detailed question and analysis on 3D performance. We greatly appreciate his effort.

Tim has the full details here on how seemingly small things can make a lot of difference in

re: Optimizing 3D Collections in WPF

joewood — Fri, 01 Sep 2006 16:27:20 GMT

Thanks Tim, great advice.

What about adding a method on these collections (or any part of the tree) to suspend notifications. Then another method to resume. Maybe use the IDisposable 'using' pattern...

Tim Cahill on Optimizing 3D collections in WPF

Henry Hahn — Fri, 08 Sep 2006 03:05:04 GMT

Tim Cahill, a developer on the WPF Performance Team, posted a great article on optimizing 3D collections...

WPF 3D Performance Troubleshooting

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Manipulating MeshGeometry3Ds? Learn to do it the fast way!

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If you need to manipulate the data in a MeshGeometry3D, you should read Tim’s article on Optimizing

Appunti di WPF: Ottimizzazione di collection 3D

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Appunti di WPF: Ottimizzazione di collection 3D

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Charles Petzold has been experimenting with cell shading on his blog at the request of Chris Cavanagh

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Noticias externas — Sat, 08 Sep 2007 07:09:02 GMT

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Tim Cahill WPF Performance Guidance Thoughts amp Tips Optimizing 3D | debt consolidator

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