Lightning Fast Performance and User Experience

Walmart leads the way in retail, but came to Formidable with help in their mobile experience and checkout flow.

The desktop and mobile screens of Walmart with two Walmart boxes in the foreground.


  • Rebuilt the Walmart’s Pharmacy app with React Native
  • Rebuilt checkout flow with React, training the Walmart Mobile team in the process
  • Improved performance by 50%
Walmart logo
ReactReact NativePerformance Optimization


Auditing Code + Removing Inefficiencies = Increased Performance & Conversions

Walmart had already invested in re-architecturing their website in React, so Formidable needed to dig into the details to increase the speed of the Walmart Checkout system and improve conversion rates. On the mobile side, the build for each section began with planning the UI so the common components could be shared. Once the main components of the app were created, the Formidable team needed to expose native functionalities like barcode scanners, hook up the real data to the real services to ensure the app was functioning correctly, and finally embed the new React Native Pharmacy app into the Walmart iOS app.

UI Inventory Audit — The project began with an audit of the existing site, noting all UI inconsistencies and points of friction in the user experience.


Auditing the Existing App

Formidable began the process by auditing the existing Checkout app to determine what improvements could be made. During the two week audit, we found a critical mass of legacy code that needed to be pared down to improve load times. After presenting findings and suggesting improvements, Formidable was able to reduce the code bundle from 1.1MB to 617KB in the course of one week.

Optimizing the Code

From there, we continued to work with the Walmart team to improve and optimize code, choosing updates strategically to ensure that the payoff would be worth the effort required. Working collaboratively gave us a chance to train the Walmart team on best practices, enabling them to improve other portions of their website once our work was done.

React Checkout Experience at Scale

Formidable was able to reduce the Walmart Checkout application bundle by nearly 50%, which led to a huge improvement in speed and performance for users worldwide.

Training the Team

Formidable successfully trained the Walmart team on React and React Native best practices. We are committed to shipping great products and making sure our clients have the skills to keep the forward momentum going.


Reduced code bundle and load times by 50%

The updates Formidable made to the Walmart Checkout code bundle greatly improved performance, which, in turn, improved conversions, and ultimately increased sales and revenue. Because the Walmart team is now well-versed in React best practices, they can apply the principles used to optimize the Checkout code bundle to their entire code base, giving them the opportunity to increase performance and conversions across the board.


Load time reduction

Decreasing code bundle size and improving load times increased conversions