Grokking Modern Mobile System Design Interview
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Lists, Images, and Memory

A long feed needs to keep scrolling responsive while loading data and images. The main questions are how much work each update causes and how much memory remains in use afterward.

Use the complete frame budget

A 60 Hz display interval is about 16.7 ms; at 120 Hz it is about 8.3 ms. Several visible rows, layout, and rendering work share this time.

A 30 ms task on UI execution can delay multiple display opportunities. The exact number of missed frames depends on timing and the rendering pipeline

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