Death Sprint 66
Cyrex partnered with Sumo Digital to deliver high-scale load testing and security validation for Deathsprint 66, simulating real player behavior across matchmaking, gameplay, and backend systems to ensure a stable, seamless multiplayer launch.
The Challenge
Preparing a High-Speed Multiplayer Title for Global Launch
Deathsprint 66 is built around fast-paced, competitive multiplayer action. In a game defined by precision and speed, even minor latency, instability, or backend disruption can immediately impact immersion and player trust.
For Sumo Digital, launch readiness meant more than basic stress testing. The online ecosystem — from authentication and player data to matchmaking and live race sessions — needed to perform flawlessly under heavy concurrency.
The team needed to answer critical questions before release:
- Could backend services handle a surge of global players?
- Would matchmaking and Unreal UDP server connections remain stable at scale?
- Could player progression, inventory changes, and leaderboard updates process reliably under pressure?
- Were there hidden bottlenecks that might only appear during peak concurrency?
To ensure a smooth day-one experience, Sumo Digital required realistic, large-scale simulation of player behavior across the entire multiplayer lifecycle.
The Cyrex Solution
Full-Flow Load Testing Across Online Services
Cyrex collaborated closely with Sumo Digital to design and execute a comprehensive load testing campaign that mirrored real-world player interactions from login to post-match activity.
Rather than testing isolated endpoints, we simulated complete gameplay flows across the online ecosystem.
End-to-End Player Journey Simulation
Our simulated users performed actions including:
- Authenticating with backend services and retrieving session tokens
- Fetching static content such as items, maps, and region data
- Retrieving player profiles, achievements, and statistics
- Modifying loadouts between races (suits, reactions, banners)
- Initiating matchmaking flows
- Connecting to the Unreal UDP server for live races
- Retrieving updated stats and leaderboard data after matches
- Performing social actions such as sending friend requests and forming squads
By executing these scenarios at scale, Cyrex was able to observe system behavior under realistic peak conditions. This allowed us to:
- Identify backend bottlenecks
- Detect degradation points under concurrency
- Evaluate matchmaking and session handling stability
- Validate infrastructure resilience before launch
The focus was not simply on volume — but on validating performance across dynamic, interconnected multiplayer systems.
The Outcome
Validated Scalability and Launch Confidence
- Early identification of scalability limitations
- Optimization of backend performance before release
- Increased confidence in matchmaking and race session stability
- Assurance that multiplayer services could support global player demand
Client Feedback
Sumo Digital
“Cyrex are market leaders in security testing and played a key role in preparing our games for launch. They carried out both penetration and load testing, helping us identify and address potential vulnerabilities early. Their detailed reports, complete with suggested actions, gave us the insight and confidence needed to ensure our game was secure, stable, and ready to meet the demands of players from day one.”
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