Environment

1. react-native -v: 0.47.1
2. node -v: 8.1.0
3. npm -v: 5.3.0

• Target Platform: ios
• Development Operating System: macOS

Steps to Reproduce

I am rendering about 50 items with Flatlist. Initial rendering takes about 500ms, but at some point, I will replace data array with new one, which has completely different set of items.

When this happens, re-rendering takes about 1 second.

Expected behavior

Rendering should not be slower than initial.