Dynamic loading means loading data on request, from the server. For example, a PHP script could supply data dynamically to a Webix component.
Dynamic loading is useful for long datasets since data populates the component in smaller portions. Initially data fills the view to some extent and later on it is dynamically loaded each time you scroll up and down the view or switch among pages.
For linear structures (used in the majority of Webix data components) you can control the process by specifying:
Read more at Dynamic Loading for Plain Structures.
Read more at Динамическая загрузка иерархических данных.
Note that dynamic loading works only if the functionality is supported by the server.