Gantt Chart - virtual scrolling is unusable Validated

Hi,

When we try to load the Gantt Chart control with more than around 100 rows, the loading time becomes unacceptably long (around 8 seconds) (also the Gantt lags a bit after it has been loaded, when there are 100+ rows). The guidance that you provide for this, is to enable virtual scrolling.

The issue with virtual scrolling though is that every time the user scrolls even a tiny amount, the user needs to wait about a second for the contents to load. This makes it very hard for users to navigate and find items, as the contents keep disappearing and re-appearing. In other modern applications, the loading time is much less and scrolling is much less jarring to the user.

You can just look at the example that you provide at https://ej2.syncfusion.com/react/documentation/gantt/virtual-scroll#row-virtualization. Even scrolling down a single row, and up a single row, will make the user lose focus, as the contents disappear for a second then re-appear. 

Is there some way to improve the performance of the Gantt chart? For example, once the rows are loaded, don't throw them away, when the user scroll away. And/or pre-fetch more rows outside of what the user sees. At the moment, it's hard to use the Syncfusion Gantt chart for any non-trivial amounts of data.

Thanks