Disabling it? I would delete that crap off my phone in a second if it was possible!
Let me tell you a story about my little iPhone 6. I had it now for more than 3 years, it is still on 82% on its original battery. And what did those "very stable geniouses" at Apple did? They somehow decided that my iphone battery isnt powerful enough so my phone's been throttled for the past 6+ months. I cannot emphasize HOW EFFING ANNOYINGLY SLOW MY PHONE WAS WORKING! And i've NEVER EVER had a random shutdown on my iphone. Yet Apple geniouses obviously thought, i needed CPU throttling.
Unlocking/locking: When unlocking phone, animation would be laggy, all the icons would "fly down" like crap. When locking - it would sometimes take 2 seconds, after clicking the lock button, for the lock sound to "click".
Messages: Everytime i opened messages app it took FIVE (5!) seconds just to open the damn app. When i then started typing a message, no letters would appears. Only ater 3 seconds suddenly all the typed in letters would appear in a second!
Phone app: It would take 3 seconds just to load the phone app, another 3 seconds to load the recents page. And sometimes it didnt even refresh recent calls correctly. A lot of times i would click recent page, saw the contact on top which i wanted to call, clicked on it - EEEEE - in the last milisecond phone would frefresh recent page and it would throw to the top a number that should've been there from the start. So it caused me to start calling wrong contact. A phone app on a phone, how much more basic function is this?!
Camera: It took 5 seconds just so the camera would open (number of moments i missed that way is amazing). And when i took a picture, it took another 3-5 seconds just to show me the picture i took!
bluetooh: bluetooth streaming to my two UE BOOM speakers at once was more or less useless since my phone randomly started stuttering and lagging because it couldnt support enough CPU power for streaming to two speakers at once.
Instagram: Out of all apps instagram stories were probably the worse - Everytime i watched some story, if i swiped down to close it, i would have to swipe it down at least 5 more times since the phone couldnt even handle the graphics that goes with swiping down the story in instagram!!! It was THAT bad.
Browsing on webpages in chrome: I lost count how many times i just locked the phone and threw it away(sometimes over entire room) since the damn phone couldnt even handle a normal scrolling on a homepage, that my HTC from 2012 could easily do! CONSTANT LAG, constant delay with loading text from site while scrolling (sometimes up to 3 seconds!!)
And every other app would take AGES to load/open.
So what happened after upgrading to iOS 11.3? Well my phone, miraculously, works normally again! No lag, every app opens normally, i can easily stream Bluetooth music to both speakers again, everything else works smoothly and i have no random shutdowns.
So thank you very very much apple for making my phone the way it used to be, before you wanted to force me to buy a new phone.