best for your lovely Mi 4i

BEST ROM :---
1)C.M 12.1 by wilson@3q (super smooth and stable)
2)MOKEE 5.1.1 (smooth and super stable)
3)RESURRECTION REMIX 5.1.1(super customizable but little laggy)
4)SLIMBIT 6.0 (AOSP)

KERNEL:---
Sensei kernel
CPU TWEAK :-----
Cyron Tweak
http://ift.tt/1RlJZve

THERMAL TWEAK :----
http://ift.tt/1RlKepY

WEB BROWSER :----
Uc web browser(smooth scrolling )

CPU SETTING APP:----
Kernel auditor

from xda-developers http://ift.tt/1Web7nV
via IFTTT