Extremely Low Performance on 'Updates' Tab

Originator:me
Number:rdar://42799548 Date Originated:August 1 2018, 1:12 PM
Status:Closed Resolved:
Product:iOS App Store App Product Version:iOS 12 beta 5
Classification: Reproducible:Always
 
Area:
App Store

Summary:
On the Updates tab in the iOS App Store app, when scrolling downwards, during the period where the 'Updates' title is transitioning from the large title style to the regular title, the scrolling performance severely drops. Once the transition is complete, performance returns to normal.

Steps to Reproduce:
1) Open App Store app on iOS
2) Tap 'Updates' tab.
3) Slowly scroll down the screen.
4) Observe low performance for the initial period of scrolling.
5) Observer normal performance once the large title transition is complete

Expected Results:
60fps / 120fps scrolling performance during large title transition.

Actual Results:
5 fps performance (approximate)

Version/Build:
iOS 11.4.1
iOS 12 beta 5

Configuration:
Tested on iPad Air (2013) running iOS 12 beta 5
Tested on iPad Pro 10.5" running iOS 11.4.1

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