title: Data binding 15,000 items in a combobox is too slow
body: <p>So as the title suggests, I have about 15,000 items and I'm trying to bind them to a ComboBox. well I have a data grid and I tried using a DataGridComboBoxColumn which was slow so I switched to a DataGridTemplateColumn using DataTemplates but it's not any faster. I've been searching online for a long time and I profiled my code and the majority of the time isn't being spent in my code. So my question is how would I speed that up? I'm pretty new to WPF and C#. My collection is a static ObservableCollection that I'm binding to the ItemsSource. </p>