Hi Alan,
Thank you for your update.
Regarding scrolling performance:
Currently, we have handled UI Virtualization in our SfRichTextBoxAdv control by default, to utilize optimal memory. Hence the content within view port of SfRichTextBoxAdv control will be rendered during initial load. While scrolling, the contents will be rendered dynamically when brought into viewport.
Regarding the issue “paragraphs replaced with empty space when scrolling”:
We can reproduce the mentioned issue in our SfRichTextBoxAdv control. A support incident to track the status of this issue and the feature (scrolling performance) has been created under your account. Please log on to our support website to check for further updates
Regards,
Venkatesan M.