Why "beauty camera apps" don't use GPU?

Hi everyone, after I turn on Profile HWUI rendering while I was using some beauty camera apps such as: 360 camera, Ulike, …

The “Orange Bar” very long for some first seconds but then it stop move.

And this is my app, it also have “Orange Bar” very long but it continue use GPU for drawing, so the Bars continue slide to left side.

so, I wonder why beauty camera apps don’t use GPU while it still drawing the filters?