Performance issue when show RichTextBlock inside ScrollViewer

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I have a RichTextBlock in a ScrollViewer, when the content of the RichTextBlock is too long, there will be very serious performance issue. FYI, the actual height of the RichTextBlock is about 580000. How can I solve this problem?

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IMHO, RichTextBox should support Virtualization out of the box. However if you still face performace issue you should consider for third-party vendors like Telerik, Syncfusion or DevExpress.