High-Concurrency Load & Performance Testing
High-concurrency load testing for multiplayer games, SaaS platforms, and enterprise APIs. We simulate real-world traffic patterns - not just synthetic pings - to stress-test your architecture and identify breaking points before your launch.
No-commitment consultation
Proposals in 5 days
Trusted by 150+ studios
Trusted by Industry Leaders
The Cyrex Advantage: Performance Engineering at Scale
Load testing isn't just about generating traffic; it’s about generating the right traffic.
Real-User Simulation at Scale
We replicate full user journeys - authentication, matchmaking, transactions, session persistence - rather than sending isolated requests. This reveals the architectural weaknesses that traditional tools miss.
Multiplayer-First Methodology
Our testing is built for high-concurrency multiplayer environments where latency, state synchronization, and complex backend orchestration define the player experience.
Infrastructure-Aware Testing
We model traffic against your specific architecture - cloud regions, container orchestration, load balancers, and auto-scaling rules - to identify bottlenecks in real-world, production-grade environments.
Powered by Cyrex Swarm™
Our proprietary technology enables network-level, headless traffic simulation capable of modeling millions of concurrent users across API, TCP, and UDP layers. This is load testing engineered for production, not lab conditions.
This is load testing engineered for production environments - not lab conditions.
Powered by Cyrex Swarm™
Traditional load testing tools focus primarily on HTTP-level traffic, leaving them blind to the complexities of persistent multiplayer sessions and custom binary protocols. We built Cyrex Swarm™ to bridge that gap.
Cyrex built Swarm to solve this.
Why Swarm Was Built
Multiplayer games and large-scale platforms require:
- Persistent session simulation
- Socket-level traffic modeling
- TCP and UDP protocol replication
- Authentication and matchmaking orchestration
- Infrastructure-aware scaling validation
Generic tools cannot accurately simulate these environments at scale.
What Swarm Enables
- Headless bot simulation at network level
- Multi-million concurrent user modeling
- Spike and peak traffic reproduction
- Real-world concurrency behavior
- Detection of scaling thresholds and collapse points
Our Load Testing Services
We align our testing methodologies with your specific infrastructure needs to ensure stability, reliability, and performance.
Stress Testing
Simulates sustained traffic beyond normal operating capacity to determine system breaking points and resilience thresholds.
Ideal for understanding maximum load limits
Key Capabilities
When to Engage Load Testing
Performance isn’t a one-time check; it’s a lifecycle requirement. Load testing should align with your traffic risk events. We synchronize our testing with your key development milestones to ensure your architecture is validated exactly when it is most exposed to traffic volatility.
Infrastructure rarely fails under average load. It fails under peak concurrency.
Testing should reflect that reality.
Systems We Test at Scale
Cyrex specializes in high-concurrency environments across:
Each system type introduces distinct scaling constraints. Our traffic modeling reflects these operational differences.
Load Testing Engagements Delivered
Cyrex has validated infrastructure at scale for AAA studios and enterprise platforms.
Warhammer 40K: Speed Freeks
Caged Element & PLAION
Death Sprint 66
Sumo Digital (supported by Tencent)
NFL Rivals
Mythical
Nitro Nation: World Tour
Mythical
Mech Arena
Plarium
Predecessor
Omeda Studios
RAID: Shadow Legends
Plarium
Rumbleverse
Iron Galaxy Studios & Epic Games Publishing
Scavengers
Improbable Worlds Limited & Midwinter Entertainment
Space Punks
Jagex & Flying Wild Hog
Trusted by the Best
Real experiences from teams we've protected
Cyrex is clearly the market leader. They go beyond simple testing to provide full player-representative load testing that gives us 10/10 confidence for launch.
Tencent
Productive and insightful. Cyrex helped us uncover potential bottlenecks in Dying Light: The Beast before release, ensuring a smoother player experience.
Techland
Market leaders in security. Their detailed reports and suggested actions gave us the insight needed to ensure our games were stable from day one.
Sumo Digital
Crucial expertise for the launch of Dune: Awakening. They were highly responsive and instrumental in resolving security and performance issues.
Funcom
A key partner in scaling our multiplayer capabilities. Cyrex delivers quality, flexibility, and results that greatly benefit our live service games.
Avalanche Studios
Cyrex made penetration testing a breeze. Their insights are spot-on and their understanding of the gaming industry is exceptional.
AccelByte
Cyrex is clearly the market leader. They go beyond simple testing to provide full player-representative load testing that gives us 10/10 confidence for launch.
Tencent
Productive and insightful. Cyrex helped us uncover potential bottlenecks in Dying Light: The Beast before release, ensuring a smoother player experience.
Techland
Market leaders in security. Their detailed reports and suggested actions gave us the insight needed to ensure our games were stable from day one.
Sumo Digital
Crucial expertise for the launch of Dune: Awakening. They were highly responsive and instrumental in resolving security and performance issues.
Funcom
A key partner in scaling our multiplayer capabilities. Cyrex delivers quality, flexibility, and results that greatly benefit our live service games.
Avalanche Studios
Cyrex made penetration testing a breeze. Their insights are spot-on and their understanding of the gaming industry is exceptional.
AccelByte
Cyrex is clearly the market leader. They go beyond simple testing to provide full player-representative load testing that gives us 10/10 confidence for launch.
Tencent
Productive and insightful. Cyrex helped us uncover potential bottlenecks in Dying Light: The Beast before release, ensuring a smoother player experience.
Techland
Market leaders in security. Their detailed reports and suggested actions gave us the insight needed to ensure our games were stable from day one.
Sumo Digital
Crucial expertise for the launch of Dune: Awakening. They were highly responsive and instrumental in resolving security and performance issues.
Funcom
A key partner in scaling our multiplayer capabilities. Cyrex delivers quality, flexibility, and results that greatly benefit our live service games.
Avalanche Studios
Cyrex made penetration testing a breeze. Their insights are spot-on and their understanding of the gaming industry is exceptional.
AccelByte
Our Load Testing Process
Structured, repeatable, and aligned with production risk.
System Analysis & Traffic Modeling
We review architecture, scaling rules, and concurrency goals. Realistic traffic scenarios are defined based on expected user behavior.
Scenario Design & Infrastructure Setup
Swarm bots are configured to replicate user workflows across authentication, matchmaking, transactions, and session persistence.
Load Simulation & Monitoring
Traffic is deployed incrementally or in spikes while monitoring CPU, memory, database performance, network throughput, and scaling behavior.
Reporting & Optimization Guidance
We deliver detailed reports identifying bottlenecks, collapse thresholds, and configuration weaknesses, with actionable remediation guidance.
Load Testing FAQs
Stress testing applies sustained load beyond capacity to determine breaking points. Spike testing simulates sudden traffic surges to validate scaling responsiveness.
Using Cyrex Swarm, we can simulate millions of concurrent users depending on architecture and engagement scope.
Yes. When required, production testing is conducted in a controlled manner with defined safeguards to avoid unintended disruption.
Standard tools focus primarily on HTTP requests. Cyrex Swarm simulates full user behavior at network level, including TCP/UDP protocols and persistent multiplayer sessions.
Yes. All engagements include actionable guidance to resolve identified bottlenecks.
Most engagements range from 2–6 weeks depending on system complexity and concurrency requirements.
Validate Your Infrastructure Before Traffic Does
Unvalidated concurrency is a launch risk.
Simulate peak traffic, stress thresholds, and real-world load conditions before users expose architectural weaknesses. Work directly with our engineers to assess your system at scale.