This is an awful experience. iOS 11 is way too buggy. Clash Royale lags when you set your brightness to zero. With this brightness setting, I managed to make the whole OS laggy. Animations were running with like 10 FPS. The more I kept pulling down the Control Center, the laggier the OS got. Then it got frozen for a few minutes, and a respring happened. While the OS was laggy, I made a Geekbench test, and the results were more than shocking. Just before you ask, no, the phone wasn't in a power saving mode, it was on charger. Only reboot fixed the HORRIBLE lag. I was able to reproduce this WHOLE STORY. Only on X.