Load and search RadComboBox with large volume of items

[Praveenraj]

We use RadCombobox (WPF) for loading more than 20000 items.

We enabled the following properties and removed the Virtualization properties. We are facing performance problems on searching the items from RadCombobox element. How can we improve performance for the RadCombobox load and search, if virtualization properties cannot be used.

<telerik:RadComboBox
x:Name="itemBox"
HorizontalAlignment="Stretch"
CanAutocompleteSelectItems="True"
DisplayMemberPath="Name"
EmptyText="Select the item"
IsEditable="True"
IsFilteringEnabled="True"
IsTextSearchEnabled="True"
ItemsSource="{Binding ItemCollection, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
OpenDropDownOnFocus="True"
ScrollViewer.VerticalScrollBarVisibility="Auto"
SelectedItem="{Binding SelectedItem, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
TextSearch.Text="Name"
TextSearchMode="Contains" />

[Dinko]

Hi Praveenraj,

Thank you for contacting us.

When you use filtering, UI virtualization is not supported, and your program becomes slow.

I would suggest you take a look at our RadAutoCompleteBox control instead. It is virtualized by design and supports filtering, which improves its' performance. In addition, filtering could be asynchronous in order for your application to be more responsive.

If you have any further questions, please contact me.

Regards,
Dinko
Progress Telerik