The piece of hardware inside the mi pad is nothing short of monstrous but the culprit here is the software which is not optimized for the hardware of such caliber. I am not into the heating club because such powerful hardware will heat up with graphic intensive tasks.
Problem is ram management which is pathetic. you run any music app in background and then browse on chrome, after 5 minutes music will stop because the system thrives for some free RAM and then you press home button and you see the launcher getting redrawn again, then you switch back to chrome and see chrome loading websites from scratch.
The way ram management is done it seems like the device has only 512mb ram. and you will never figure out who eats that much ram even when the tablet is lying idle for few hours. the whole miui software is a beta or alpha version of a final product(however miui in my mi4 is great). wish there was some stock android goodness to the mi pad.