Performance and debuggingPayPal
Where to start on scroll stutter
On a phone screen the interviewer asks: "A user reports that scrolling stutters. Where would you start?" Walk through the diagnostic order and what you look at in each step.
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Performance and debuggingMultiple choiceBasics
You inherit an app whose UICollectionView stutters while scrolling. Which of these can ca…
#scroll #main-thread
UIKitShort answerAdvanced
You get a report that scrolling stutters on a feed screen that mixes images and text. Whe…
#scroll #hitch
Performance and debuggingShort answerBasics
All you've got is vague feedback that "the app is slow." How do you approach that with In…
#time-profiler
Performance and debuggingMultiple choiceIntro
Tapping a certain button freezes the screen for about a second. To see which function on …
#time-profiler