On S117, rooted and xposed. Used SetCPU to change the governor to NOOP. Don't why i always use that governor.

So far, so good.

Can check my post here on how to root. You'll lose stock recovery, but you can install your preferred recovery.
Download the arm64 installer zip, uninstaller zip and apk from here.

I use this app here to freeze and unfreeze app
Try whatsmapp (note the M, and not the whatsmapp solo). Read more about it here.

Errr do you enable "unknown source" in setting > security?

Just want to mentioned there is a strong competitor in term of spec is the Meizu M2 Note, seem like there is also another forum member notice it.
i compare the spec in GSMArena, current!ly Malaysia is selling the 16GB Meizu M2 Note at Lazada only with Rm100 discount, but there is a 32GB version which is expected to arrive later this year.
in term of difference:
1) K3N use separate slot for microsd card, M2N use SIM2.
2) K3N microsd card up to 32GB only but M2N up to 128GB.
3) K3N has FM radio M2N does not have. Dunno why seem like a simple feature why need to cut cost.
4) K3N has 3000mAh battery, M2N has 3100 mAh battery.
5) K3N has Dolby Atmos M2N has none.

If I have to resort to ori set the M2N feels more attractive. If 32GB M2N got come for me is no brainer to get it alr. Lenovo Malaysia makes a too late marketing strategy if they only bring K3N at December.

Hi there, I just order one k3 note from lazada. Does it necessary to root the phone before use? Any problem u guys facing with the  stock rom? Pls advice. Thanks

S121 antutu scored 45.7k....performence not much different compare with s117 on my K3N.