Client-side PDF Viewer performance

Question

I have a client-side Blazor app and use the SfPdfViewer. When I scroll through the document with the mouse wheel, the viewer stutters as I scroll. Is this to be expected? This even happens when I scroll to pages that have already been viewed and the PdfViewerController does not get called.

Also, it seems that the control renders pages on demand from PdfViewerController. Other tools that I have used have a feature to define the number of pages "below the fold" that get loaded. For example, setting this to 3 would load pages 2, 3, 4 when you are viewing page 1. In this way the page is already in memory when it comes time to display it. Perhaps something like this would be useful in your tool.

Regards,

Arthur

Akshaya Arivoli · Accepted Answer

Hi Arthur ,  

Thank you for contacting Syncfusion support.  

Please finds the details of your query from the below,  





Query  

Details  


I have a client-side Blazor app and use the SfPdfViewer.  When I scroll through the document with the mouse wheel, the viewer stutters as I scroll.  Is this to be expected?  This even happens when I scroll to pages that have already been viewed and the PdfViewerController does not get called.  

We were unable to reproduce the reported issue with the provided details. We have shared the sample in which we have tried in the below link,  
  
https://www.syncfusion.com/downloads/support/forum/158400/ze/BlazorApp1_(10)907050645  
  
Please try and revert us with more details about the issue, PDF document and the modified sample If you still have concerns.  


Also, it seems that the control renders pages on demand from PdfViewerController.  Other tools that I have used have a feature to define the number of pages "below the fold" that get loaded.  For example, setting this to 3 would load pages 2, 3, 4 when you are viewing page 1.  In this way the page is already in memory when it comes time to display it.  Perhaps something like this would be useful in your tool.  

In our PDF Viewer during initial loading Page 1 and 2 will be rendered and on further scrolling the current, previous and the next pages will be rendered in PDF Viewer on demand, other pages will not rendered. The other pages will be rendered on demand while scrolling.  
  
Please revert us with more details and the use case if you have concerns on the provided details, which will be helpful for us to investigate further and assist you better.  
  
  
 
Regards,  
Akshaya

Query	Details
I have a client-side Blazor app and use the SfPdfViewer. When I scroll through the document with the mouse wheel, the viewer stutters as I scroll. Is this to be expected? This even happens when I scroll to pages that have already been viewed and the PdfViewerController does not get called.	We were unable to reproduce the reported issue with the provided details. We have shared the sample in which we have tried in the below link, https://www.syncfusion.com/downloads/support/forum/158400/ze/BlazorApp1_(10)907050645 Please try and revert us with more details about the issue, PDF document and the modified sample If you still have concerns.
Also, it seems that the control renders pages on demand from PdfViewerController. Other tools that I have used have a feature to define the number of pages "below the fold" that get loaded. For example, setting this to 3 would load pages 2, 3, 4 when you are viewing page 1. In this way the page is already in memory when it comes time to display it. Perhaps something like this would be useful in your tool.	In our PDF Viewer during initial loading Page 1 and 2 will be rendered and on further scrolling the current, previous and the next pages will be rendered in PDF Viewer on demand, other pages will not rendered. The other pages will be rendered on demand while scrolling. Please revert us with more details and the use case if you have concerns on the provided details, which will be helpful for us to investigate further and assist you better.