The Xiaomi Mi 4 scored a decent score of just over 35100 points on AnTuTu Benchmark, with balanced mode.
However, it could only manage to score a little over 44000 points on AnTuTu Benchmark, with performance mode.
This is a little lower than what it managed on MIUI 6.
Here are some screenshots from the Xiaomi Mi 4 running MIUI 7.
(The start screen, status bar, new toggle icons, and notification blocker).
(Default themes in MIUI 7, Themed toggle icons, Text Size, and Free RAM).