[Development] QT_XCB_NATIVE_PAINTING makes worse that without of it

[Denis Shienkov]

Hi guys.

I have iMX6 board with Qt 5.11.2 and Qt-widgets based application. I have
compiled my Qt with an 'xcb_native_painting' option.

I was hoping that this would speed up my UI and reduce the load on the CPU,
but I was greatly mistaken:

When the QT_XCB_NATIVE_PAINTING is not set, I got following top:

* Xorg: 3.6 %
* app: 12.8 %

When the QT_XCB_NATIVE_PAINTING is *set*, I got following top:

* Xorg: 23 %
* app: 4.5 %

What? QT_XCB_NATIVE_PAINTING makes it worse in 2x-times... WTF?

BR,
Denis
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