Open WPF window is slow due to layout affecting

Question

I have a problem with wpf. The problem is my window, which uses some auto and * columns in a Grid, it is opening very slow. I've used the Visual Studio debugger to investigate what the trouble is, and found it in the layout section. The message is:

Changes were made to XAML visual tree that required the size and/or position of all affected elements to be computed.

Here is a screenshot of the debugger:

What is the best way to detect the exact problem with the layout? Or are there some general rules I could follow?

Thank you very much, I did not experience this behaviour with wpf before, even with large usercontrols / windows...

EDIT I don't use any animation of transformation to rotate controls. In general it is a very flat window. As an additional information, scrolling through GridViews in the window is also very slow.

Answer 1

Off the top of my head (and re-iterating a few of the comments):

• Are you using nested IsSharedSizeScope? This can cause cascading layout updates.
• Have you turned off virtualization and have many items in the grid? This can cause slow and studdering performance.
• Try to isolate the issue by removing stuff until it works (or removing a lot and adding things back until the issue starts to reappear)
• Post your code here so we help you better

Answer 2

I had the same issue. The reason was accidentally switched OFF virtualization in ListView in XAML file. Probably copy/paste from web. Changing from false to true made the magic.

VirtualizingPanel.IsVirtualizing="True"