When the listbox has many items (roughly 200 and growing) the item attribute makes the listbox act slow when you want to click the item.
Even if the item render only returns the same value as not setting the item attribute. It seems like all the items re-render when it gets clicked?
Also in this example https://www.telerik.com/kendo-react-ui/components/listbox/customization/ it is possible to drag and drop a custom item.
But this is not working when we copy exactly the same code from the example. The drag event gets triggered but nothing happens.
Both lists have items to avoid this bug: https://github.com/telerik/kendo-react/issues/1300
I can post my source code but it is literally the same as the example. When we remove the item attribute the drag and drop works again.