System Design front end interview questions #viral #fyp #shorts

Answer :
• Main thread blocking: The UI runs on a single thread. If heavy work (like parsing or renderin or large data) is done synchronously, it blocks user interaction.

• Expensive rendering: Large DOM updates or complex layouts can stall the UI even after the API responds.

• Synchronous processing: Doing loops, transformations, or JSON parsing directly on the UI thread instead of asynchronously causes freezes.

• Poor async handling: Waiting synchronously for data or misusing async/await can block the interface.

• Garbage collection: Memory‑intensive operations can trigger GC pauses that block rendering.
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