HW in this case means hardware acceleration, and stacking layer means using CPU for auxiliary computation, rather than GPU for full rendering. Because GPU rendering is relatively more power-intensive, HW overlay layer is generally turned on by default.
In this way, high power consumption caused by hardware acceleration can be effectively avoided and mobile phone fluidity can be effectively improved to achieve a dual balance between performance and power consumption.
1 Netflix might not work properly.
2 only remedies the situation , does not cure any OS problems
3 every time you restart , setting is reset to default
4 Animation scale reduction to .5x Also resets after restart. (Different topic)