What?
Doesn't the Construct 2 manual say that construct loads everything before you can even start the game? Meaning no matter how many layouts you have they will all be loaded by the time you can play the first layout.
And from there how long can it take to load things into memory. I've never experienced any jerkiness when switching layouts
From the manual:
"Construct 2 only loads the images for the current layout. This avoids loading the entire project in memory which would be slow and consume a great deal of memory. When starting a layout, all images for the objects placed in the Layout View are pre-loaded. This includes all frames in all animations of any Sprite objects. (In other words, Sprites are either fully loaded in to memory, or not at all - they are never part-loaded.) When the layout ends, all images that are loaded but not used on the next layout are released from memory."
My guess is that you haven't done any asset heavy projects yet but for us who do stutter and long loading times between layouts is a big big issue. But as I said easily solved now with the possiblity to preload exactly what you want.
And you don't have to put all assets on one layout as newt said. You can load exactly what you want however you want.