Sports-Betting Mobile App Optimisation for Entain CEE

Conducting an App Health Check and improving the performance of a high-traffic sports betting app.

Project Overview

Services

Mobile

Technologies

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Entain is a global sports betting and gaming group operating worldwide, managing a portfolio of leading betting brands. We began our collaboration by working with Betsys, a Czech company focused on sports betting, part of STS SA, the biggest bookmaker in Poland, which delivers the STS mobile application serving the Polish market.

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The app was already live and growing, but performance issues were starting to impact key user flows during peak usage.

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Within two months, we conducted an App Health Check followed by a focused performance optimisation phase.

Highlights of the Collaboration

Structured App Health Check across frontend, backend, and shared KMP layers
Performance constraints identified and prioritised based on business impact
Execution of the two-month optimisation roadmap
Significant performance improvements immediately acknowledged by the user base

Challenges and Objectives

Approach

Instead of jumping straight into optimisation, we started with a structured app health check to understand where performance issues came from and how they affected business-critical flows.

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Together with the mobile Program Manager and mobile engineers, we prioritised optimisation areas based on business impact and technical complexity, covering frontend architecture, backend interactions, and shared Kotlin Multiplatform layers across iOS and Android.

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To objectively validate the improvements, we introduced controlled cross-platform testing using identical devices and consistent measurement conditions. Results were presented to stakeholders through a live demo, providing clear visibility and supporting further decision-making.

Results

The audit confirmed a solid foundation but revealed implementation patterns that were limiting performance in interaction-heavy scenarios.

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This resulted in a focused two-month roadmap, delivered across both platforms by a dedicated Flow team working closely with Betsys developers.

Key outcomes included:

Up to 70-80% reduction in CPU usage in selected high-load scenarios
Faster execution of complex user interactions and improved rendering efficiency
Reduced memory usage and power consumption, contributing to more stable runtime performance

These improvements directly impacted user experience in high-stakes moments, where speed and responsiveness influence conversion and retention. User perception reflected the technical progress, with Customer Satisfaction improved, reaching 74 percent following the optimisation phase.

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The project showed that many performance issues in mature mobile apps can be addressed through targeted optimisation, without the need for disruptive architectural changes or a full rewrite.

"The app health check gave us clear visibility into performance bottlenecks and helped us set clear priorities. The optimisation phase brought great improvements across key user flows in just two months. The Etnetera team proved their value through concrete results, such as increased customer satisfaction on both iOS and Android. Additionally, our mobile developers appreciated the collaboration with Etnetera's engineers, valuing their contribution to the app's development and the open exchange of experience. Partnering with them was a great step for our apps, which is why we have decided to continue our collaboration."

Adrian Talowski

Mobile Program Manager, Entain CEE

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