Display multidimensional array

os mojave
react-native v 0.60 and swiper v 1.5.14
I have array with 100 pages with data. Swiper is slow when use second map.
This is my code:

         <Swiper showsPagination={false} index={initpage} loadMinimal loadMinimalSize={2}>
          {dataPageVar.map((item, key) => {
            return (
              <View key={key} style={styles.slide}>
                {item.pages.map((it) => {
                    return(<Text style={styles.text}>{it.text}</Text>)
                  })}
              </View>
            )})}
         </Swiper>

Is there some solution. Data are displayed slow.

Start with the provided Swiper component usage and nested dataPageVar.map/item.pages.map example; the issue names no repository file or test. Reproduce the slow rendering with the stated React Native and swiper versions, then establish a measurable improvement for the 100-page multidimensional array case.