React Developer for Web App Performance Diagnosis

I’m looking for a React developer to help diagnose performance issues in a web app used for a travel business.
The app is already functional, but some parts of the interface feel slower than they should, especially when navigating between views or loading data-heavy sections. Before I invest in larger development work, I want a developer to review the frontend and identify what may be causing the slowness.
This is a small diagnostic task, not a full rebuild.
What I need help with:
review the relevant React code/components
identify likely causes of slow performance
point out obvious issues such as unnecessary re-renders, poor state handling, or oversized components
suggest the most important improvements to prioritize first
The app includes typical travel-related views such as listings, booking details, filters, and dashboard-style pages, so experience with data-heavy interfaces is a plus.
What I can provide:
access to the relevant code or files
notes on which parts of the app feel slow
brief context on how the affected pages are used
Deliverable:
A short technical diagnosis explaining the likely cause of the slowdown, plus practical recommendations on what should be improved first.
If you’ve worked on React performance issues in dashboards, booking flows, admin panels, or similar web apps, feel free to apply.