Performance across the stack

Summary

Being able to discuss performance holistically — a slow page could be a rendering issue, a slow API, or an unindexed database query, and diagnosing which requires full-stack thinking.

• 1Prepare a structured answer: measure first (frontend and backend), then optimize based on data.
• 2Have a real example ready where you found a performance issue was actually in a layer you didn't initially suspect.
• 3Practice explaining the full request path when discussing where time is spent.