Used for configuring virtual scrolling:

selector: 'my-app',
template: `
 <kendo-dropdownlist [data]="listItems" [virtual]="{ itemHeight: 28, pageSize: 10 }">
class AppComponent {
  public listItems: Array<string> = ["Item 1", "Item 2", "Item 3", "Item 4"];

itemHeight number

Sets the height of the items.

pageSize? number

Sets the amount of items that will be rendered in the DOM.

skip? number

Defines the number of records that will be skipped.