S912 hardware, when using FFMPEG CPU Software decoding like 720p Netflix and Kodi Leia, needs at a minimum Kodi Dirty Regions disabled ie, OFF:
However you then need good chipset cooling, because the CPU and GPU gets a real workout.
Even then I’m not sure it works properly due to the Hybrid GPU drivers used.
In the end it is far simpler to dual boot and run an Android TV ROM with its easy to use 1080p Netflix App on MECOOL, WeTek Play2 or MINIX U9 hardware.
I even have 1080p (HEVC) 5.1 DD+ Audio - Amazon Prime video working with an ATV ROM on the U9.
Like Shoog, I have no problems with LE streaming, either local or IPTV with S912 hardware.
(I do not use LE / CE Netflix)