Previously only the newer iPad Pro models could run 3 apps simultaneously on screen with two split screened apps and one slide over app. Older iPad models with only 2 GB of ram used to freeze (and grey out) the two split screened apps when you summon a slide over app.
Now in iOS 12, old iPad models (like the iPad Pro 12.9” 2012, and iPad mini 4) can simultaneously run 3 apps.
Not that it couldn’t before, because in the first few betas of iOS 10, these older models were able to run 3 simultaneous apps at once, no problem, with no hit to battery life. It was a shame that Apple disabled this later on, I’m glad it’s back though... hopefully this isn’t a bug.
Now in iOS 12, old iPad models (like the iPad Pro 12.9” 2012, and iPad mini 4) can simultaneously run 3 apps.
Not that it couldn’t before, because in the first few betas of iOS 10, these older models were able to run 3 simultaneous apps at once, no problem, with no hit to battery life. It was a shame that Apple disabled this later on, I’m glad it’s back though... hopefully this isn’t a bug.