Note 4 is a model of Xiaomi in Redmi series. The device was launched on February 2017 and it was the budget king of that time.
The specs of this device are:
Processor:Snapdragon 625
GPU:Adreno 506
RAM:3/4 GB
Storage:32/64 GB
Camera: Rear 13 MP(with dual tone flash)
Front 5 MP(no flash)
Slots: Hybrid Sim Slot
And the device performs well today. But the software the manufacturer gave is MiUi. It is very customizable and good looking ROM. But it is very RAM hungry. That affects your gaming performance.
So, I have a solution to that you can use Lineage OS 14.1.
It is the best ROM for note 4/4x(SnapDragon Version). Cause it has no bloatware and the system is not laggy cause it has the stock Kernel. Lineage OS 15.1 has custom kernel. But stock kernel has no lags. So I prefer 14.1 which is Android 7.1 Nougat. And it is the best ROM for your Redmi device.
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