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Originally Posted by mgdv You can change the display resolution to 1080p (or even 720p) with a simple adb command on ANY android 5.0+ smartphone. Код: adb shell wm size 1080x1920 enter any resolution, it will work just make sure to adjust the screen density so it looks correct: Код: adb shell wm density 480 (480 is usually what most phones use on 1080p) After you do this, some items on your phone's screen may look glitched. All you need to do is restart your phone after this and it will look perfect. For some reason, almost no one knows about this and it's super easy. Whenever I get a new phone, I reduce its resolution - it runs so much faster and it improves the battery life slightly.

This is a nice "hack", but why would you buy a super modern phone with an extreme high-res screen, just to reduce the resolution and make it look worse? Would you buy a 4K PC monitor just to set the PC to 720p? (maybe if you want to upgrade the hardware later on, but this is actually impossible for smartphones)

Also, speed boost is mostly subjective. The phone is especially designed to support the screen resolution without any performance drawbacks. Hardware buffers, ram, and GPU are picked to fit the screen. Speed is a much more important aspect of smartphones today than screen resolution, because theres barely any difference between 1080p and 2K on a tiny 6" phone screen.
Using a screen with a resolution that slows down the phone would be a fatal mistake that would cost a lot in money and reputation.