Google Flutter Google Flutter Performance

Question 1

Which Flutter tool provides a visual overlay showing render performance with colored bars?

Accepted Answer

Performance Overlay

Answer

Flutter Inspector

Answer

Widget Profiler

Answer

Frame Analyzer

Question 2

What is the target frame rendering time to achieve 60 FPS in Flutter?

Accepted Answer

16ms

Answer

8ms

Answer

32ms

Answer

33ms

Question 3

Which widget should you use to avoid rebuilding expensive subtrees when parent state changes?

Accepted Answer

const constructor widgets

Answer

RepaintBoundary

Answer

StatelessWidget

Answer

AnimatedBuilder

Question 4

What does RepaintBoundary do in Flutter's rendering pipeline?

Accepted Answer

Isolates its child on a separate compositing layer to avoid repainting the whole tree

Answer

Clips its child to a rectangle

Answer

Adds a border for debugging

Answer

Forces a widget to repaint every frame

Question 5

Which Flutter DevTools tab helps identify the most expensive widgets during a performance session?

Accepted Answer

CPU Profiler / Performance tab

Answer

Network tab

Answer

Logging tab

Answer

Memory tab

Question 6

What is jank in Flutter?

Accepted Answer

Visible stuttering or dropped frames when the UI fails to render within the frame budget

Answer

A memory leak caused by unclosed streams

Answer

A network timeout error

Answer

A build error in release mode