Startup and returning to the app
We review the work before the first useful screen, loading states and the agreed startup scenarios. Device, build type and network conditions belong in the baseline.
Mobile engineering · Existing applications
React Native performance audit
Find what is slowing your app down. We profile the iOS and Android journeys that matter to your users, then give your team a measured baseline and a practical plan for improvements.
When a performance audit helps
Your application is live, but customers encounter slow launches, uneven scrolling or delayed interactions. Your team needs to know which changes will address the problem before committing engineering time.
A focused audit starts with one or more journeys you can reproduce. It can also establish a baseline before a significant release. If an Expo SDK upgrade or build failure is the immediate blocker, our upgrade and release support may be a better starting point.
What we investigate
We choose the areas that match your symptoms and agree the scope in advance. Not every application needs a review of every area.
Scrolling and interaction
We investigate the screens customers struggle with: long lists, image-heavy feeds, navigation and gestures. The review follows reproducible journeys with representative data.
Rendering and memory
We examine avoidable renders, repeated work, asset use and memory behavior where they affect the agreed flows. Findings distinguish measured bottlenecks from issues that need further investigation.
Requests and screen loading
We inspect client request patterns, state updates and loading behavior. If a backend response is the constraint, the report records that dependency and the additional work needed to investigate it.
What your team receives
- A reproducible baseline
- The tested journeys, devices, build configuration and conditions, with measurements for the agreed performance goals.
- Prioritized findings
- Evidence for each finding, its likely user impact, the proposed fix and the uncertainty that could affect implementation.
- A plan your team can use
- Recommended work in a practical order, with dependencies and acceptance checks. Your engineers can implement it, or we can scope the fixes together.
- A walkthrough and handover
- A review of the report with your team and the profiling notes needed to repeat the checks after changes.
We evaluate the agreed journeys in appropriate release builds on the agreed target devices. Results from development builds or a simulator alone can be misleading. Broader security reviews, backend audits and device coverage are scoped separately.
How the engagement works
- Share the symptoms. Send the app link, affected journey, target devices and deadline. A short recording or reproduction steps help narrow the work.
- Agree the scope. We review the brief and define access, deliverables, fee and schedule. Source access and a suitable build are arranged through an agreed secure channel.
- Review the findings. We walk your team through the measurements and proposed work, including constraints and open questions.
- Choose the next step. Your team can implement the plan, or we can agree a separate implementation scope and repeat the acceptance checks after changes.
Before you commission a review
Can you review an Expo app?
Yes. We review React Native applications using Expo as well as projects with custom native code. We agree how to produce and access the appropriate build before profiling.
Will the audit include fixes?
The audit covers investigation, findings and a verification plan. Implementation is a separate scope unless included explicitly in the proposal. This keeps the review useful to teams that want to make the changes themselves.
What does an audit cost, and how long does it take?
We quote after reviewing the app, the affected journeys, target devices and access requirements. The proposal states the scope, fee, schedule and deliverables before work starts. A single problematic screen and a broad application review need different scopes.
Can you guarantee 60 FPS on every device?
Performance targets need a defined device, workload and measurement method. We agree those conditions, measure the baseline and verify the scoped changes against it. A universal frame-rate promise would leave out the constraints that matter to your users.
Tell us where your app slows down
Send your app link, React Native or Expo version, the affected journey, devices and any delivery deadline. These details help us propose a useful first scope. Keep credentials and private customer data out of the initial message.
Need help preparing the brief? Read our guide to hiring a React Native development team.