WPF ComboBox performance problems by binding a large collections

Question

I\'m trying to bind a large collection to a ComboBox and I faced performance problems when opening ComboBox\'s popup. I searched internet and found that using VirtualizingSt

Answer 1

I just ran into this issue as well. I'm using this code in a custom combo box with a style template. When I ran my code in VS debugging mode the virtualization did not work properly. Once I ran it outside of debugging I can switch the content of the ObservableCollection without locking the UI up. It also might help if you set a max height and max width.