How do you improve Core Web Vitals on a React site?
PICTURE THIS: REACT RENDER CYCLE
Simple meaning
I target LCP with optimized hero images and server or static HTML where possible.
WHY — Performance instead of guessing?
Why interviewers care about Performance:
question about Performance.
trade-offs, and what you would actually do on a Frontend project - not buzzwords.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1I target LCP with
optimized hero images and server or static HTML where possible.
- 2INP and CLS improve
with less main-thread JS, stable image sizes, and avoiding layout shift from ads or late fonts.
- 3Code splitting and lazy
routes cut unused JS.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
I target LCP with optimized hero images and server or static HTML where possible. INP and CLS improve with less main-thread JS, stable image sizes, and avoiding layout shift from ads or late fonts.