From the XAML code, I could suggest that the RadRichTextBox is placed inside a ScrollViewer. As explained in the UI Virtualization article
, this could lead to performance issues. RadRichTextBox is measured in Infinity and its ui virtualization is disabled, which forces the control to load the whole document at once.
The other tips we could suggest for decreasing the initial loading time are listed in the MEF article
. You could take a look at it just to verify that all the tips are applied in your project.
The public forms doesn't allow attachments other than images. If you would like, you could contact us through our support ticketing system
. There you can attach archive files.
Hope this information is helpful.
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