FrontendHaltBrowser internals·Intermediate·Conceptual·1 min read
How would you diagnose jank?
Short interview answer
Record a performance trace during the exact interaction, identify long tasks and frame misses, inspect style/layout/paint events and their initiators, then change one cause and remeasure on representative hardware.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.