Knowledge Explorer Step 13: Measure, Then Fix One Thing

Open the profiler and record yourself typing a query. Look at what re-renders on each keystroke and how long it takes. Write down the single worst offender before changing anything. Then fix that one thing, preferring to move state down over adding memo, and record again to confirm it actually helped. If the profile shows nothing meaningfully slow, that is a legitimate result: write that down and change nothing. Resisting an unnecessary optimization is the skill being practiced here.