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# From Profiler to Production: Measuring What Actually Matters in React & React Native


- **Event:** Conference India 2026

## Description

Every React developer knows how to open DevTools. Far fewer know which numbers to trust — and which ones are lying to you.
Lighthouse scores look great in reports but don't always correlate with real user experience. Bundle size matters, but not in the way most teams optimize it. And in React Native, the JS thread can be silently killing your UX while your profiler shows green.
I work on the Dynatrace React Native agent — SDK-level instrumentation that runs inside production apps across a wide range of codebases. That gives me an unusual vantage point: not just how one app performs, but what patterns consistently hurt performance across many apps, on both web and mobile.
In this talk, I'll walk through the metrics that actually matter — TTI, JS thread jank, startup time, hydration cost — and show how to measure them properly using Hermes profiler, Flashlight, React DevTools, and custom instrumentation. I'll share real before/after benchmarks from web and React Native projects, and explain how to build a measurement culture in your team so performance doesn't regress the moment you stop watching.
No generic advice. No "just memoize everything." Real numbers, real tools, real workflows.

## Speaker

### [Andrei Tazetdinov](https://www.wearedevelopers.com/@andrei-tazetdinov)

Senior Software Engineer & Tech Evangelist


## Related talks at this congress

- [React Under Fire: Rendering Performance for Streaming Agent UIs](https://www.wearedevelopers.com/events/conference-india-2026/sessions/1992-react-under-fire) — Abhirupa Mitra
- [How We Cut Our API's p99 Latency from Minutes to Under a Second](https://www.wearedevelopers.com/events/conference-india-2026/sessions/1987-how-we-cut-our-api-s) — Deepak Agrawal
- [AI Is the Easy Part: Why Faster Engineers Don't Make Faster Businesses](https://www.wearedevelopers.com/events/conference-india-2026/sessions/1975-ai-is-the-easy-part) — Bharat Sharma
- [We Deleted Our Observability Stack and Rebuilt It with OTEL: 12 Engineers to 4 at 20K+ clusters](https://www.wearedevelopers.com/events/conference-india-2026/sessions/1998-we-deleted-our) — Yash Sharma

## Watch remotely

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## Links

- [Get tickets](https://www.wearedevelopers.com/conference-india/tickets)