Thursday, February 5, 2009

Dog slow WPF transparency

It's been awhile since my last post, I've been busy at work so had to take a break from my TeamCity exploits, and then I got side-tracked building a little utility for myself.

The application is built in WPF and is yet another .NET natural language command window, but with some neat tricks. It was however, performing absolutely terribly, and I thought I only had myself to blame. Initially I thought it was me patching into some unmanaged funtions for some of the jiggery-pokery, as outlined below.


However, I was unable to work out why SOO much time was being taken in the GetMessageW and DispatchMessage funtions, it was a real mind-f**k. After exausting all possibilities, I tried some random attacks here and there, one of them was turning off the transparency on the main window, and low and behold, the application is now performing super-quick, but why? Some googling turn up this.

So unfortunately, if your on an unpatched Vista or XP, you will need to get one of the following patches...



According to the thread it seems the hotfix is already in Vista SP1 and XP SP3. Glad I found this one before... doesn't bear thinking about; my fault for not updating to SP1.

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