Most founders and engineering leads know performance testing is important. What’s harder is figuring out which tests to run, when to run them, and in what order as your company grows.

As a result, many startups skip performance testing until something breaks in production, or they run the wrong test and end up with a false sense of security.

Finding performance issues after a launch costs much more than catching them early. Problems like a cloud platform crashing during a launch, a SaaS solution leaking memory over several days, or an API slowing down during a sales demo often happen because performance testing was skipped or done incorrectly.

This guide explains the main types of performance tests, what each one helps you find out, and when it’s time to use them.

The Core Types of Performance Testing

Load Testing: Does Your Solution Handle Real-World Traffic?

Load testing checks how your solution handles the number of users or transactions you expect during normal and busy times. It helps you answer a key question: does your system work well when real people use it?

Run load testing before any big launch, major marketing push, new enterprise deal, or feature release. If you’re showing a live demo to investors, load testing is a must.

Signs you need load testing now:

• You’re approaching your first large customer deployment
• Your user base is growing faster than you anticipated
• You’ve added new features and haven’t tested the combined impact on performance
• You’re migrating infrastructure or switching cloud providers

Load testing helps you spot slow response times, higher error rates, and resource bottlenecks before your customers notice them.

Stress Testing: What Happens When Things Go Wrong?

Stress testing pushes your solution past its usual limits to see how it acts under intense pressure. The goal is not to mimic regular use, but to find where things break and what happens when they do.

Does your software crash completely, or does it slow down in a controlled way? Does it recover on its own when things calm down, or do you need to fix it manually? If one part fails, does it cause problems in other parts too?

Stress testing is important before you handle sensitive data, work in regulated industries, or sign enterprise contracts where downtime can cost you money or reputation. It’s also key before any event that might bring a sudden spike in traffic.

Signs you need stress testing now:

• Your solution is entering a regulated industry (fintech, healthtech, govtech)
• You’re signing enterprise contracts with uptime guarantees
• You’ve experienced unexpected traffic spikes and don’t know how your system responded
• You’re preparing for a viral launch or a high-profile product moment

Scalability Testing: Can Your Architecture Grow With You?

Scalability testing validates whether your solution can handle increasing load by scaling its infrastructure up or out, and whether it can scale back down efficiently when demand drops.

This is particularly important for cloud-native solutions and SaaS platforms that rely on auto-scaling features. It’s one thing to configure auto-scaling policies; it’s another to prove they trigger correctly, scale at the right speed, and don’t introduce performance degradation during the transition.

Scalability testing is critical at two distinct moments: when you’re designing your architecture before a major build, and when you’re validating that your current infrastructure can support your growth projections.

Signs you need scalability testing now:

• You’re pitching enterprise customers and need to demonstrate your solution can support their scale
• You’re approaching resource ceilings on your current infrastructure
• You’ve implemented auto-scaling but haven’t validated it under realistic conditions
• You’re planning a significant expansion into new markets or customer segments

Endurance (Soak) Testing: Will Your Solution Run for Days Without Failing?

Endurance testing (often called soak testing) runs your solution under a sustained load for an extended period, typically 24 to 72 hours or longer. It exposes problems that only emerge over time: memory leaks, database connection exhaustion, disk I/O buildup, and gradual performance degradation.

These issues are difficult to catch with short-duration tests because they don’t manifest immediately. A solution can appear perfectly healthy under a 30-minute load test while slowly accumulating memory that will crash the system after 48 hours of production use.

Signs you need soak testing now:

• Your solution needs to run continuously without scheduled restarts (IoT platforms, monitoring tools, data pipelines)
• You’re deploying to customers who expect 24/7 availability
• You’ve had production incidents that weren’t reproducible in short testing windows
• You’re entering industries where downtime carries regulatory or liability risk

Latency Testing: Are Your Response Times Acceptable?

Latency testing measures how quickly your solution responds to requests across its various components, including network hops, API calls, and database queries. It validates that response times meet user expectations and requirements under real-world network conditions, including high-latency environments.

For user-facing solutions, latency directly affects conversion rates and retention. For backend platforms and APIs, latency determines whether integration partners can meet their own SLAs.

Signs you need latency testing now:

• You’re integrating with real-time systems where milliseconds matter (payments,
• communications, medical devices)
• You’re expanding into geographic markets with different network conditions
• Your API is a core part of a partner’s product
• Users or prospects have mentioned slow response times as a concern

Throughput Testing: Can You Handle the Volume?

Throughput testing measures how much data your system can process within a given time period. This is relevant for solutions that handle high-volume data streams, such as IoT platforms ingesting sensor data, analytics pipelines processing event logs, or messaging systems routing large numbers of transactions.

Signs you need throughput testing now:

• Your product processes or routes large volumes of structured or unstructured data
• You’re targeting customers with significantly higher data volumes than your current users
• You’re planning to add new data sources or integrations that will increase ingest load

Resource Utilization Testing: Are You Paying for More Infrastructure Than You Need?

Resource utilization testing identifies how your solution consumes CPU, memory, disk I/O, and network bandwidth under different load conditions. It helps you size your infrastructure, which directly affects your operating costs.

For startups watching burn rate, over-provisioning infrastructure is a quiet cost drain. For scaleups with investors watching gross margins, inefficient infrastructure use is a strategic liability.

Signs you need resource utilization testing now:

• Your infrastructure costs are growing faster than your revenue
• You’re preparing financial projections for a fundraiser and need accurate infrastructure cost forecasts
• You’re moving from a startup pricing tier to enterprise infrastructure and need a clear baseline

Security Performance Testing: Do Your Security Controls Affect Performance?

Security performance testing validates that your solution’s security mechanisms, such as encryption, authentication flows, and authorization checks, don’t create unacceptable performance overhead. It’s possible to be secure and slow, which creates real trade-offs in user experience and platform reliability.

Signs you need security performance testing now:

• You’ve recently added or upgraded security features and haven’t measured the performance impact
• You’re entering a sector with strict security requirements (government, defence, healthcare)
• You’ve received feedback that authentication or data access workflows feel slow

How CENGN Helps Canadian Tech Startups and Scaleups Get Performance Testing Right

Running meaningful performance tests requires more than a testing tool and a staging environment. You need enterprise-grade infrastructure, expert guidance on test design, and a secure, isolated environment that mirrors production conditions closely enough to produce reliable results.

That’s exactly what CENGN’s Performance Testing Services provide.

Through the CENGN Living Lab Initiative, Canadian startups and scaleups carrying out CENGN projects have access to dedicated testing infrastructure, including bare-metal servers and virtual machines, without the capital investment required to build it themselves. Each project also includes support from CENGN’s customer solution specialists, who work with you to plan, implement, and execute the right tests for your solution’s current stage, helping you avoid the common mistake of running the wrong test at the wrong time.

Their services cover the full range of performance testing types described in this article: load testing, stress testing, scalability testing, endurance (soak) testing, latency testing, throughput testing, resource utilization testing, and security performance testing. All testing is conducted in a secure, multi-tenant environment with guaranteed data isolation, and all data infrastructure is located within Canada to comply with data residency requirements.

Eligible Canadian startups and scaleups will receive non-dilutive funding to support their CENGN project, enabling them to conduct enterprise-grade testing without the full cost falling on the company.

Ready to Validate Your Solution?

If you’re preparing for a product launch, an enterprise sale, a fundraising round, or just want to understand how your solution will perform at scale, CENGN’s Performance Testing Services give you the infrastructure, expertise, and validation you need to go to market with confidence.

CENGN is supported by the Canadian Government’s Strategic Response Fund. Since 2014, CENGN’s programs have created nearly 12,000 Canadian jobs, contributed $1.15 billion to Canada’s GDP, and completed over 230 commercialization projects.

Validate your solution in real-world environments. Beyond performance testing, some solutions need to be proven in the operating conditions of the industry they will serve. The CENGN Living Lab Initiative provides Canadian startups and scaleups with real-world testing environments, sector-specific expertise, and non-dilutive funding to help them get market-ready. If that is the next step for your solution, a Living Lab Project can help you get there. 

About the Author

CENGN, Canada’s Centre of Excellence in Next Generation Networks, drives technology innovation and industry growth through our testbed, technical expertise, talent development, and partner ecosystem. Through our projects, CENGN enables small and medium Canadian Enterprises to test and validate promising technologies, removing barriers to product commercialization and accelerating market growth.

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