In Vaadin 8, it was possible to use ConnectorBundleLoaderFactory to defer loading of certain components, to speed up the rendering of the initial view, usually the login view. You can read more about this in the Optimizing the widget set Vaadin 8 documentation page. What’s the replacement in Vaadin 24?

Since Vaadin 24.1, it is possible to perform similar optimizations in the webpack bundle. See the Production Bundle Component Loading Optimizations for more details.

Vaadin 24 by default eager-loads components for the main route and the login route, and lazy-loads all other components, which is exactly what we usually want. Therefore, the recommended practice is to drop ConnectorBundleLoaderFactory completely when migrating from Vaadin 8, and only introduce the bundle loading optimizations if there is a clear measurable performance bottleneck.