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lazy loading image - photos carousel

import Carousel from 'react-material-ui-carousel'

 https://levelup.gitconnected.com/lazy-loading-images-in-react-for-better-performance-5df73654ea05

<Carousel autoPlay={false} navButtonsAlwaysVisible={true}>
{(photos || []).map((photo, i) => (
<PhotoViewCard key={i} photo={photo} />
))}
</Carousel>

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