Add note about renderToHardwareTextureAndroid back

Author: jamonholmgren

docs/performance.md

@@ -65,6 +65,8 @@ The [`Animated API`](animated.md) currently calculates each keyframe on-demand o
 
 One case for using this is animating in a modal (sliding down from top and fading in a translucent overlay) while initializing and perhaps receiving responses for several network requests, rendering the contents of the modal, and updating the view where the modal was opened from. See the [Animations guide](animations.md) for more information about how to use `LayoutAnimation`.
 
+This is especially true on Android when you have text with a transparent background positioned on top of an image, or any other situation where alpha compositing would be required to re-draw the view on each frame. You will find that enabling `renderToHardwareTextureAndroid` can help with this significantly. For iOS, `shouldRasterizeIOS` is already enabled by default.
+
 **Caveats:**
 
 - `LayoutAnimation` only works for fire-and-forget animations ("static" animations) -- if it must be interruptible, you will need to use [`Animated`](animated.md).