Wpf: Why is WriteableBitmap getting slower?

There is a bug in WriteableBitmap for WPF in . Net 3.5 that causes any call to AddDirtyRect to invalidate the entire image, not just the rectangular region.

In . Net 4, the writeable bitmap still invalidates the whole region no matter where you add a dirty rect. You can confirm this using Perforator, part of the Windows Performance Toolkit that comes with the Windows SDK v7.1.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.