We make your React Native app measurably faster.
Slow startup, dropped frames, jank in lists? We profile on real devices and fix the causes — Expo and bare React Native.
Does this sound familiar?
Performance problems rarely show up in the code first — they show up in your users’ everyday experience. Four symptoms we fix regularly:
Slow startup
Dropped frames in lists
Crashes after updates
Store ratings dropping
The App Performance Audit
A fixed-scope entry point: we measure what actually slows your app down — before you invest in fixes.
Performance audit for existing apps
A standardized audit for Expo and bare React Native apps — including apps built by other teams. You get:
- Profiling on real devices — from budget Androids to current iPhones: startup time, interaction latency, scroll performance, stability
- Prioritized findings: the causes with the biggest impact first, explained in plain language
- A concrete implementation plan: what can be fixed and how much effort it takes — actionable by us or by your own team
Fixed scope, limited slots per month. Planning a new app instead? See our app development services.
Our principle
Measure, don’t guess.
Performance problems aren’t solved by guessing. We measure first — startup time, frame rate, interaction latency — then fix the causes with the biggest impact. And then we measure again.
- Profiling on real devices, not just the simulator.
- Every fix is re-measured — impact instead of assumption.
- Measurably faster: we share before/after measurements in the first call.
How the optimization works
- 01
Performance audit
We profile your app on real devices and find the causes — fixed scope, clear results.
- 02
Findings review
We walk you through the prioritized findings together — plain language instead of jargon.
- 03
Implementation
We fix the highest-impact causes first — senior-led, reviewed and tested.
- 04
Re-measurement
The same measurements as at the start: the impact of every fix is proven, not claimed.
- 05
Ongoing support
On request we keep performance in check long-term — across OS and SDK updates.
Common causes we fix
Performance work is engineering, not guesswork. These are the issues we find — and fix — most often. If your app was largely built with AI tools and needs more than speed fixes, our fix-vibe-coded-app service is the better starting point.
- Bundle size and startup work: oversized JavaScript bundles, eager imports and blocking initialization that delay the first screen
- Unnecessary re-renders: components re-rendering on every state change — fixed with memoization and better state architecture
- List virtualization: long lists rendered without virtualization, causing dropped frames while scrolling
- Image pipeline: full-resolution images, missing caching and decoding work on the wrong thread
- Native modules and the bridge: chatty native calls, outdated modules and work that belongs on a background thread
- Animations on the JavaScript thread: moving them to the UI thread keeps interactions smooth even while JavaScript is busy
FAQ
Why is my React Native app slow?
The most common causes are oversized JavaScript bundles, unnecessary re-renders, lists without virtualization, an unoptimized image pipeline and blocking work during startup. Which of these applies to your app can only be determined reliably by profiling on real devices — that is exactly what the audit does. You get a prioritized list of causes, each with the expected impact of fixing it.
What does the performance audit include?
Profiling on real devices for iOS and Android: startup time, interaction latency, scroll performance and stability. You receive prioritized findings and a concrete implementation plan — what can be fixed, and how much effort each fix takes. The scope is fixed, so you know upfront exactly what you get. You can have us implement the fixes or hand the plan to your own team.
Do you need full access to our codebase?
Read access gives the most useful results — but a lot can already be measured on the running app, so first findings are possible without code access. We treat your code as confidential, and an NDA is no problem. Discretion is part of how we work: we never name clients.
Should we optimize or rebuild?
Honest answer: optimization is not always worth it. If the architecture is sound, targeted fixes are usually far more economical than a rebuild. If the foundation can no longer carry the product, we say so clearly — including a recommendation for what a rebuild should look like. That assessment is part of the audit: you decide based on measurements, not gut feeling.
Do you also fix apps built by other teams — or by AI tools?
Yes — most performance work we do is on apps we didn’t build, and a clean handover is part of the audit. That includes apps built with AI tools: if your app was largely AI-generated and needs more than performance fixes, our fix-vibe-coded-app service takes it from prototype to production — security, architecture and performance included.
Start a project
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WhatsApp — the fastest way
A quick question, a small project, or just want to start simple? Message us directly.
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