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I've found iOS 12 better when switching apps on my iPad Air and iPhone 6. I think previous iOS versions used too much RAM, so apps were being unloaded when not in use. iPad Air and prior only have 1GB, later ones have 2GB and some have 4GB.
A symptom of lack of RAM is (I believe) apps reloading when you return to them after using other apps. I've found this to be getting worse and worse with every version of iOS since iOS 6, to the point where I would almost expect an app to reload after switching to just one other and back again. It's still a problem, of course, but is definitely happening less.
The real issue is that app writers aren't programming around this. Apps should save their state when iOS forces them closed, and restore it again when you return to it. Even Apple's native apps didn't do this when the memory shortage started to become apparent. Mail used to just lose the email you'd half typed, iBooks just closed the book and lost the page you were up to.
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