Well, I’ve found out the problem. It’s because of TDP limit.
[The Problem]
When CPU is on light load, The tablet runs smoothly. But when you start doing something, It will start to lag.
It is because CPU and GPU shared the same power limit and is limited at only 6w. (Sometimes, It went a few more for a few seconds. Then it returns to 6w)
When CPU is not doing anything. (Which consumes lesser power) There are more power to be used by GPU. But when CPU starts consuming more power. GPU will start to reduce its clock because there is not enough power for it. (GPU clock rarely exceed 450Mhz from max at 700Mhz and Been fluctuating a lot)
That’s why disabling Turbo Boost make the system run smoother. Because CPU run at lower clock, It means lesser power consume. Leaving more power headroom for GPU.
[The Fix]
The way i use to fix is override/unlock the TDP limit. Not in the BIOS (As it doesn’t seem to do anything) But in the Windows. By the program called “RWEverything” and write some command to override TDP limit.
All the instructions are in this thread.
(UBook Pro N4100 [Boosting Performance])
Note: TDP limit override by this method is NOT permanent. You’ll need to redo the instructions from the thread everytime you shutdown, restart or wakeup from sleep.
Ps.1 Yes, It did improves a lot of performance both gaming and system smoothness at the cost of more power and higher temperature (around 85c for me). So, try at your own risk.
Ps.2 I don’t know about doing this in Linux.