The trick involves a slightly roundabout way of removing the animations that make it look like apps are flying around the screen as they are opened or closed. Not many iPhone users like these animations and so they could very well have a faster iPhone instead. Apple added a way of getting rid of some of the animations using the “reduce motion” setting that can be found in the accessibility menu. But getting rid of them entirely used to require jailbreaking the phone — a process that was difficult, long and often risky. So if you want to make your iPhone faster without jailbreaking it, head to the ‘Assistive Touch’ settings, which can be found by searching at the top of the Settings app. From there, turn on the ‘Assistive Touch’ switch. Then head to the Home screen as normal and place the new little button you’ve added to the bottom right of the screen. Leave it there and get the Spotlight search menu up by swiping down on the home screen. When the new button is just above the keyboard, tap the screen so that the search menu goes away. The glitch should now be in place, and you might notice iPhone more responsive. If not, keep trying — it might take as many as 20 times for it to start working all of the time.
This glitch was found by a Redditor and pointed out by 9to5mac.