Webix addSpan very slow

I am getting an issue while rendering the webix datatable. I have in my grid 25 columns and i have added rowspan functionality. Now in ie browser, when i am doing scrollpane movement , it is taking long time to render and after a 2 or 3 second i am able to show the rows back. I have check webix refresh method is recreating the span row on x or y movemnt of scrollpane. can you suggest me how can i make this render a fast.
Thanks

@gizmogaurav can you share a snippet?

Please, check the snippet: Code Snippet

Yep, Webix is recreating the spans on scroll movements, but is doesn’t have such big rendering lags as you describe. If the issue persists, please share your snippet.