Browser & Web Performance · Senior · Question 16 of 75

What does the Long Animation Frames (LoAF) API add over the Long Tasks API?

✓Correct answer: It reports slow frames with script attribution: which scripts, functions and source URLs ran and for how long
2It reports only tasks shorter than 50 ms
3It measures network round trips

Explanation

Long Tasks only told you that something was slow. LoAF explains why, including rendering time and forced layouts.

Further reading

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