Best practices for multiple small scenes

I currently have my project split up into a scene per unique screen. The game enters at a title screen, then there's a game selection map, a options screen for each of the games, and the mini-games themselves. Each individual scene has only a few textures and the content is very slim... however, there is a noticeable pause when clicking a button that loads a new screen. A loading screen between each transition would be a bit strange and annoying during navigation.

Is the best way to deal with this to merge all the scenes together (or at least all the non-game scenes) and enable/disable root objects for each as the player clicks through? Will this have a detrimental effect on memory usage? Alternatively, is there any way to speed up scene transitions? One PC and Mac, the transitions are instant, but a phone of course has much more limited resources.