react-native-calendars: CalendarList super slow rendering in iOS (RN 0.47.2)

Description

CalendarList component renders super slow and it stops rendering after some time. (iOS)

Expected Behavior

I create a CalendarList component and display it in my root view. I can see the calendar list, scroll it and use it.

Observed Behavior

I create a CalendarList component and render it in the my root view. The calendar works fine in simulator, but on iPad and iPhone devices it starts rendering very slow, and some times it just get stuck in big Month names and not render the calendars at all. (Using 4 calendar in the list). It is imposible to use it.

Environment

• npm ls react-native-calendars: React-native-calendars@1.5.8

• npm ls react-native: react-native@0.47.2

1. Phone/emulator/simulator & version:

Simulator: iPhone 6s Devices: iPhone 5S, iPad Mini , iPhone 6

Reproducible Demo

Just install the npm package and try to display a CalendarList component. Example:

<CalendarList
             minDate={'2017-08-22'}
             maxDate={'2017-09-02'}
             firstDay={1}
             pastScrollRange={0}
             futureScrollRange={4}
             markingType={'interactive'}            
         />