While we do not have an example of a loader, there is something I can suggest you do to increase the initial loading time of RadRichTextBox. Please check the code snippet in this article
which shows how to manually initialize the catalog loaded by MEF
. Placing the snippet in your application should significantly increase the loading time.
As to your other questions, at this point lines are not supported in RadRichTextBox. The feature is in our to-do list, but I cannot say when it might be implemented. You can subscribe to this item
in the Feedback & Ideas portal to be notified for our progress on this.
When it comes to loading images with relative paths, you can take advantage of the export/import settings of HtmlFormatProvider. This
article explains the settings in details and the attached application shows how to utilize the ImageExporting/LoadImageFromUrl events.
I hope this helps.
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