Is Core Animation color blended layers useful or say is it necessary?

Color Blended Layers Open Instruments and choose the Core Animation template located under iOS / Graphics. First, click in the Core Animation instrument's timeline to reveal the bottom pane and find the section labeled "Debug Options". Check the "Color Blended Layers" box, which will show a red overlay over layers that were blended and a green overlay over layers drawn without blending.

Is Core Animation color blended layers useful or say is it necessary? I found that the system UI is red blended yet. And my app is also red blended in some areas.

what should I do?

Thanks in advance.

Yeah, It's necessary to fix the blended layers, For example: you background have a white color and you add a label in the view .and set background color clear color. This will make your layer blended. But this is unnecessary to calculate . If you set your label color same as your view. scrolling performance will improve a lot. You can feel it.