Services

Performance testing for speed and stability

Know exactly how your app behaves under pressure. Performance testing exposes bottlenecks early before they impact users, validating speed, stability, and scalability when traffic spikes and expectations are highest. It's not just about checking boxes—it's about protecting revenue during your biggest moments.

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Join the group of Startups & Fortune 500 companies that care about quality.

  • Discord
  • Twilio
  • Microsoft
  • Zoom
  • Pinterest
Key outcomes

Know your app won't break under pressure

Protect revenue during peak demand, outperform slower competitors, and keep users engaged when speed matters most. With performance testing you prevent costly failures, validate real scalability, and make infrastructure decisions based on data, not assumptions.

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Find out your limits before peak traffic hits. Stress testing shows exactly how many users your system can handle—and pinpoints the breaking point—so you prevent costly downtime and revenue loss in production.

Success story

Helping SpotMe launch new product with performance confidence

SpotMe was preparing to launch their new product, SpotMe Studio, and needed proof it could perform under real-world load. Without clear performance benchmarks or QA requirements, the risk of slowdowns or failures during critical events was too high.

Our QA engineers led performance testing to validate key metrics and ensure the product functioned as intended under pressure. This evolved into ongoing QA support, helping SpotMe release with confidence and maintain high-quality standards.

Key results:

  • Established best testing practices
  • Improved QA processes
  • Provided quality reports to stakeholders
Read full case study
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Recommendations

Align performance testing to business-critical scenarios

Validate your app under real-world conditions with performance testing to prevent wasted investment, lost revenue, and damaged reputation during launches, campaigns, updates and scaling.

ScenarioRecommended testingWhy
Planning a major launch or campaignLoad testing + Spike testingSimulate expected traffic surge and identify breaking points before 25,000 users crash your site and waste your marketing spend
Slow performance is killing conversionsLoad testing + Component testingPinpoint exactly which component (database, API, payment gateway) causes delays and recover lost revenue from cart abandonment
Releasing a major updatePerformance regression testingCompare new architecture against production baseline to ensure updates improve speed, not degrade it
App experiencing slowdownsEndurance testingIdentify memory leaks and resource exhaustion that cause gradual degradation over hours or days of continuous use
Scaling rapidlyVolume testing + Capacity planningPredict exactly when you'll hit infrastructure limits during 10x growth, allowing proactive scaling before emergency failures
Coverage

Every platform. Every breaking point. Every edge case.

Test your apps where users actually interact with them—across platforms, devices, networks, and real-world scenarios. We don't test in perfect lab conditions. Our testing happens in the chaos your users actually live in, ensuring true resilience.

Web applications

Consider all different user scenarios and edge cases. Your web app may work perfectly on a fast laptop with stable internet—but how does it perform on older devices, unstable Wi-Fi, and peak launch-day traffic?

Web app testing

Mobile applications

Put your mobile app through everyday conditions. With 70% of users deleting apps that feel too slow, even small delays matter. We test performance on real devices, under limited memory, battery drain, and unstable networks.

Mobile app testing

Desktop applications

Ensure desktop app performance where users expect instant responsiveness and zero lag. We test installs, launches, memory usage, long-running sessions, and large file handling across operating systems and hardware profiles.

Desktop app testing

Cloud solutions & APIs

Validate cloud solutions and APIs under real-world load. Auto-scaling may be configured, but does it work when traffic spikes 1000% in 60 seconds? We test scaling behavior, API limits, microservices, and cost efficiency to ensure reliability under pressure.

API testing

Consider all different user scenarios and edge cases. Your web app may work perfectly on a fast laptop with stable internet—but how does it perform on older devices, unstable Wi-Fi, and peak launch-day traffic?

We test across:

  • Browser variations
  • Different network conditions
  • Concurrent user scenarios
  • Peak traffic patterns
Web applications

Put your mobile app through everyday conditions. With 70% of users deleting apps that feel too slow, even small delays matter. We test performance on real devices, under limited memory, battery drain, and unstable networks.

We validate performance on:

  • Real devices (not emulators)
  • Battery drain scenarios
  • Data consumption under load
  • RAM constraints (older devices)
Mobile applications

Ensure desktop app performance where users expect instant responsiveness and zero lag. We test installs, launches, memory usage, long-running sessions, and large file handling across operating systems and hardware profiles.

We ensure your application:

  • Installs and launches efficiently on varied hardware specs
  • Handles large file operations without freezing the UI
  • Manages memory properly during extended use
  • Performs consistently across Windows, macOS, Linux
Desktop applications

Validate cloud solutions and APIs under real-world load. Auto-scaling may be configured, but does it work when traffic spikes 1000% in 60 seconds? We test scaling behavior, API limits, microservices, and cost efficiency to ensure reliability under pressure.

We validate:

  • Auto-scaling triggers and response times
  • API rate limiting and throttling behavior
  • Microservices communication under stress
  • Cost efficiency for Cloud subscription
Cloud solutions & APIs
Ensure speed and stability

Take care of performance. Skip the apologies.

Test your solution faster and more thoroughly by working with quality assurance experts who will help you develop a testing solution tailored to your needs.

Talk to our QA team
The scope

Performance testing that targets every risk

Choose the right test for the right risk. Each type of performance test exposes unique failure points, and together they ensure your app stays fast, reliable, and ready for anything.

Stress testing

Uncover your system's breaking point. We push your system beyond normal operating limits to find the approximate threshold and validate its recovery path. Learn how to stabilize your app when traffic is highest.

Load testing

Validate stability under expected demand. We simulate realistic user traffic, from normal daily usage to peak spikes, to ensure your system remains stable, responsive, and reliable under expected demand.

Volume testing

Measure performance with massive data sets. We evaluate how your application behaves under heavy data loads to ensure the system can handle volume efficiently, without performance degradation or data loss.

Endurance testing

Eliminate hidden, long-term failures. We sustain significant load over extended periods to detect subtle issues like memory leaks or resource exhaustion that only appear over time.

Recoverability testing

Evaluates how effectively your system can recover after failures and whether recovery objectives are met to ensure that the application can restore its state, functionality, and data integrity with minimal disruption.

Spike testing

Test for unpredictable traffic surges. We intentionally subject the system to sudden, extreme increases and rapid drops in load (like flash sales) to ensure it can handle and quickly recover from unpredictable events.

Innovations

Maximize testing efficiency with custom-built solutions

Accelerate release cycles, reduce development costs, and improve user experiences with our custom testing solutions. Gain valuable insights across every stage of the software lifecycle to optimize your digital product.

QA engineer performing audio and video quality testing using a specialized setup.

Audio & video quality testing

Deliver smooth calls for every user. Your video conferencing app may work perfectly in the office but how does it perform for users on unstable 4G or high-latency connections? Test performance under real-world conditions to ensure consistent quality for all users.

  • Call quality degradation under network constraints
  • Audio/video sync issues during bandwidth fluctuation
  • Screen-sharing performance with large file sharing
  • Multi-participant stability (2 users vs. 50 users)

Perfect for: VoIP apps, video conferencing, live streaming

Learn more about A/V testing

Battery & data usage testing

Stop battery drain from killing retention. Your app may function perfectly, but draining 40% of a device's battery in just 2 hours drives users to uninstall. Measure and optimize resource use on real devices so your app is efficient, not just functional.

  • Battery consumption during active use and background operation
  • Data usage under typical usage patterns
  • Memory footprint on various device specs
  • Competitive benchmarking

Perfect for: mobile apps, IoT devices, wearables

Learn more about battery testing
QA engineer performing battery and data usage testing

Your load & performance testing partner

Load and performance testing has never been easier. With our custom-built solution you will be able to simulate tens of thousands of users from 10+ geographical locations.

Visit loadero.com
Our process

Achieve peak performance with our proven testing methodology

Optimize performance with our 5-step performance testing methodology. Each step uncovers bottlenecks, validates fixes, and ensures your testing efforts are always efficient, transparent, and aligned with your business goals.

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  1. Planning

    We analyze your business objectives, identify critical user journeys, and define success metrics. You get a clear testing scope document outlining what we'll test, why it matters, and how we'll measure success.

  2. Design

    We develop test scenarios simulating your real users, define load profiles, and prepare test environments. You receive a detailed test plan including user behavior models, traffic patterns, and baseline performance benchmarks.

  3. Testing

    We execute tests, monitor system behavior in real-time, and capture comprehensive performance data. You get real-time dashboards showing system performance, response times, error rates, and resource utilization under load.

  4. Analysis

    We analyze collected data, identify bottlenecks, and prioritize fixes by business impact. You receive a comprehensive performance report with specific bottlenecks identified (memory leaks, API timeouts), and root cause analysis for each issue.

  5. Validation

    After your team implements fixes, we retest to validate improvements and establish ongoing performance monitoring. Validation testing confirms fixes resolved bottlenecks and performance metrics have grown.

Partner with experts

Identify performance gaps with expert-led testing

Ensure your app performs flawlessly when it matters most. Our performance testing services help companies identify bottlenecks, validate scalability, and prepare for peak traffic with complete confidence.

We uncover issues that can impact revenue, user experience, and reputation—catching slowdowns, crashes, and resource limits before they affect your users. With actionable insights and a structured testing approach, performance improves alongside your product growth, keeping critical functionality fast, stable, and reliable, so your team can focus on building features, not chasing issues.

  • 14years in business
  • 500+experienced QA experts
  • 20+countries our clients come from
  • 10physical locations
See the difference
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FAQ

Most popular questions answered

Performance testing evaluates how your software behaves under various conditions, such as heavy load, high user traffic, or limited system resources. It's crucial because a product that works fine with a few users may slow down or crash with many users. By doing performance testing, you ensure your application meets speed, stability, and scalability requirements. This is especially important for user satisfaction: a slow or unresponsive app can drive users away. In essence, performance testing helps you deliver a fast and reliable application experience by identifying bottlenecks before your users do.
It's wise to incorporate performance testing during critical milestones of your product's growth. For example, before a major product launch or marketing campaign (when you expect a user spike) is an ideal time – this lets you verify the app can handle the load. You should also do it if you've noticed slowdowns in development/staging or received feedback about slowness. Additionally, after significant changes (new features or infrastructure changes), performance testing ensures no regressions in responsiveness. Essentially, if you're planning for more users or see any signs of slowness, it's time to perform performance tests.
TestDevLab provides a range of performance testing types to cover different scenarios. We conduct load testing to check how your system handles expected user volumes, stress testing to determine its breaking point under extreme load, and endurance (soak) testing to see how it performs over extended periods. We also perform spike testing (sudden bursts of traffic) and volume testing to examine how large amounts of data affect performance. By covering these various test types, we can pinpoint performance bottlenecks and ensure your application remains stable and fast under all conditions.
We use our custom-built tool Loadero to mimic real-world usage as closely as possible. For example, we generate real users to simulate thousands of concurrent customers using your app. We also incorporate network condition simulation – testing under different bandwidths or unstable connections – to see how the app behaves on slow networks. Our engineers examine CPU and memory usage, database performance, and even factors like battery consumption under load. By testing with these real-world variables (including using real devices when needed), we ensure the performance results accurately reflect how end-users will experience the product.
A well-performing application greatly enhances user experience. Performance testing helps eliminate issues like long load times, app freezes, or crashes – all of which frustrate users. By fine-tuning your app's performance, you ensure that even under high usage, users get smooth and fast responses. This leads to higher user satisfaction, better retention, and positive reviews. Additionally, a performant app can handle growth in user base without degradation, which is critical for startups aiming to scale. In summary, performance testing safeguards the speed and reliability of your product, directly contributing to an excellent user experience.
We take data protection seriously. Every project starts with a mutual NDA, and we follow strict in-house security protocols, including ongoing staff training. Our ISO 9001, ISO/IEC 27001, and ISO 22301 certifications reflect our commitment to quality and security. Need extra safeguards? We also offer customizable, on-premise testing and enhanced security setups on demand.
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Take care of performance. Skip the apologies.

Outranking competitors starts with better software. Test your solution today and start surpassing them tomorrow!

Talk to our QA team