— The graphs are slow when filtering and scaling.
— The app crashes on vertical scrolling to the bottom right after the launch.

Y-axis values have to many zeros. When disable one chart lines behave strangely

Broken OpenGL animation on chart #4

Hello. I tested your app on OUKITEL C5. This is the real device. I found some issues:
1. The text "zoom out" and date looks so strange sometimes. (screenshot 1/video1)
2.The Growth chart looks empty at the first time. (screenshot 2/video1)
3.After rotate device, 1-2 charts looks wrong. (video 2)

Broken OpenGL animation on chart #3

Too much grid lines

It's really annoying that the app responding REALLY bad. I mean not all my taps are processed, sometime I need to perform ~5-7 clicks on zoom, or ~5-7 clicks on chart to get tooltip opened. IT'S A REALLY ANNOYING. See the video with pointer.

Performance looks BAD. I can't prove my words by screenshot with GPU bars, because you wrote the app with opengl, BUT on my eyes every animaiton is lagging and the app so far from 60fps (and even from 30fps on enable/disable animation). Just attaching the video with histogram & percentage animation.

Weird animation on #4 chart when enable & disable line and have selected bar.