We use cookies to give you the best experience on our website. If you continue to browse, then you agree to our privacy policy and cookie policy. (Last updated on: November 16, 2018).
Unfortunately, activation email could not send to your email. Please try again.
Syncfusion Feedback

Slow Scrolling With sfRichTextBoxAdv

Thread ID:





128849 Feb 13,2017 01:15 AM UTC Feb 15,2017 12:24 PM UTC WPF 3
Tags: SfRichTextBoxAdv
Alan Burkhart
Asked On February 13, 2017 01:15 AM UTC

I'm using sfRichTextBoxAdv via ElementHost in a Winforms (VB.net) project. Seems to work fine except that scrolling is very slow. Using the scrollbar arrows it jumps a few pixels at a time with a half-second between jumps. Dragging the scrollbar thumb produces a hesitation followed by a half-page jump. The same problem occurs in the "Document Editor" sample project. The same .rtf file scrolls smoothly when opened in Libre Office. It's a small (5 pages) file with no graphics.

Is this an issue with the control? If so is there a workaround to get smoother scrolling?

Thanks -- AB

Venkatesan Mani [Syncfusion]
Replied On February 13, 2017 10:38 AM UTC

Hi Alan, 
Thank you for contacting Syncfusion support. 
We have improved the scrolling responsiveness in our SfRichTextBoxAdv control and included this fix in our latest Essential Studio Volume 1, 2017. It is rolled out and is available for download under the following link. 
  Kindly update to the latest version ( and test the scrolling responsiveness in our SfRichTextBoxAdv. Please get back to us, if you require any further assistance.    Regards,  Venkatesan M. 

Alan Burkhart
Replied On February 14, 2017 06:47 AM UTC

Installed the update. Scrolling still sputters a bit but is improved. In all honesty, the scrolling issue still makes the control unusable for a production project. Still needs work. Another issue exists with this update: Now the files have entire paragraphs replaced with empty space when scrolling. This seems to occur more when dragging the scrollbar thumb than when using the arrows. But it happens in both cases. I tried it with both .doc and .rtf files with same result.

Venkatesan Mani [Syncfusion]
Replied On February 15, 2017 12:24 PM UTC

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 
Venkatesan M. 


This post will be permanently deleted. Are you sure you want to continue?

Sorry, An error occured while processing your request. Please try again later.

Please sign in to access our forum

This page will automatically be redirected to the sign-in page in 10 seconds.

Warning Icon You are using an outdated version of Internet Explorer that may not display all features of this and other websites. Upgrade to Internet Explorer 8 or newer for a better experience.Close Icon