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I have TabControl bound directly to IEnumerable<ViewModelBase> (different ViewModels), rendered using DataTemplates. BUT when switching Tabs, one can se that TabItems are completely redrawed and it’s soooo slow. Is it normal???
Is your data context truly exposing an
IEnumerable<T>as the binding source? If so, I recommend you take a look at How Data Binding References are Resolved. This won’t explicitly address the redraw issue, but if you expose your view models data source using a collection that supports the INotifyPropertyChanged interface such as ObservableCollection or a ICollectionView data source, you will get better binding and rendering performance.On the redraw side of this issue, you should take a look at this Dr. WPF post. There is a proposed solution to the performance issue you are seeing, and to go one step further you would write a TabControl subsclass, and possibly use a VirtualizingStackPanel as the items source of the custom TabControl.
This article goes over the UI and data virtualization options you might try.