Well, lazy loading is a way to hide loading time. But I didn't mean that lazy loading is bad since I think it is rather underutilized in desktop applications. Taking Photoshop as an example, I would explore the means to get the basic app up and running providing basic tools then load the rest in the background not waiting for demand. Loading on demand is nice as long as it can be done quickly. There's nothing worse than having the app loaded, click on a menu item, and then have to wait for that feature to load.