What's New in Cocoa Touch
Show Apple's description.
iOS 12 enhances the Cocoa Touch frameworks to improve app performance and deliver exciting new features. Learn about performance best practices, security improvements, tools for supporting multiple screen sizes and shapes, new APIs for iMessage apps, Siri Shortcuts, and Swift refinements. Find out which sessions you won't want to miss throughout the week.
16msto execute in a
8msin a 120hz screen device
If the function takes longer than that, the app fps (and user experience) will drop.
From iOS 10 we have a prefetch data function (that runs in the background) which helps us fetching the data before it being required to be displayed in a cell:
Improvements Under The Hood
Beside the prefetching above, this session goes deep into a lot of system improvements (cpu, different threads management, auto layout).