25+ Performance Testing Interview Questions & Answers [ Step-In ]
Performance Testing Interview Questions and Answers

25+ Performance Testing Interview Questions & Answers [ Step-In ]

Last updated on 03rd Jul 2020, Blog, Interview Questions

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In software quality assurance, performance testing is in general a testing practice performed to determine how a system performs in terms of responsiveness and stability under a particular workload. The performance tests you run will help ensure your software meets the expected levels of service and provide a positive user experience. They will highlight improvements you should make to your applications relative to speed, stability, and scalability before they go into production.

1. What is performance testing?


Performance testing evaluates system responsiveness, scalability, and stability under varying loads to ensure it meets performance expectations.

2. Name a popular open-source performance testing tool.


A popular open-source performance testing tool is Apache JMeter. JMeter is widely used for load testing, stress testing, and performance testing of web applications, web services, and more. It offers a user-friendly GUI and supports a wide range of protocols and scripting for creating test scenarios.

3. Why is monitoring important during performance testing?


Monitoring during performance testing is crucial for real-time visibility into system behavior, early issue detection, and resource optimization. It ensures that the system meets performance goals, enhances user experience, and mitigates risks, making it an indispensable part of the testing process.

4. Explain the purpose of scalability testing.


Scalability testing assesses a system’s ability to handle increased workloads by measuring its performance as it scales horizontally or vertically. It ensures that the system can grow to accommodate higher demands, identifies bottlenecks, and helps in optimizing resource allocation and architecture. Scalability testing is crucial for ensuring a system’s capacity to support future growth and maintain performance under varying levels of load.

  • Scalability testing assesses an application’s ability to handle increased load by adding resources and is vital for growth planning.

5. What is performance testing, and why is it important?


Performance testing evaluates a system’s speed, responsiveness, and stability under varying conditions to ensure it meets performance requirements. It’s essential to identify bottlenecks, optimize resources, and ensure a positive user experience, preventing performance-related issues in production and safeguarding user satisfaction and business reputation.

6. What are the common types of performance testing?


  • Load Testing: Measures system performance under expected load levels to ensure it can handle anticipated traffic without degradation.
  • Stress Testing: Evaluates system behavior at or beyond its maximum capacity to identify breaking points, potential bottlenecks, and recovery capabilities.
  • Capacity Testing: Determines the system’s maximum capacity by gradually increasing the load until it fails or its performance degrades significantly.
  • Scalability Testing: Assesses the system’s ability to scale up or out by adding resources, such as servers, to accommodate increased workloads.
  • Endurance Testing: Tests the system’s stability and performance over an extended period to identify memory leaks, resource leaks, and degradation over time.

7. Why is performance testing crucial for software development?


Performance testing is crucial for software development because it ensures that the software meets performance expectations, delivering a seamless user experience. It aids in identifying and addressing performance bottlenecks and scalability concerns early in the development cycle, reducing the risk of costly post-release fixes. Ultimately, it safeguards the reputation of the software and the organization by preventing performance-related issues in production.

8. What is the difference between Performance Testing & Functional Testing?


Performance Testing Functional Testing

To validate the behavior of the system at various load

conditions performance testing is done.

To verify the accuracy of the software with

definite inputs against expected output,

functional testing is done

It gives the best result if automated This testing can be done manually or automated
Several user performs desired operations One user performs all the operations

Customer, Tester, Developer, DBA and

N/W management team

Customer, Tester and Development

involvement is reuired

Requires close to production test environment

and several H/W facilities to populate   the load

Production sized test environment is not necessary,

and H/W requirements are minimal

9. Name some popular performance testing tools.


JMeter, LoadRunner, Gatling, Apache Benchmark, and Locust are commonly used performance testing tools.

10. Explain the key differences between open-source and commercial performance testing tools.


  • Open-source performance testing tools are like free tools available to everyone. They can be customized but might be a bit harder to use, and you’ll mostly rely on help from the online community.
  • Commercial performance testing tools are like paid tools that come with extra features and support. They’re usually easier to use, have more help available, and may work better for big and complex projects, but you need to pay for them.

11. What is a performance test plan, and why is it important?


A performance test plan is like a map for testing computer programs. It’s important because it tells the testing team what to test, how to test it, and what to look for. It helps everyone understand the testing goals, what might go wrong, and how to fix problems before the program is used by people.

12. What are the steps involved in designing a performance test?


The common mistakes done in Performance Testing are:

Designing a performance test for a computer program is like planning a test drive for a new car. Here are the simple steps:

  •  Know why you’re testing and what you want to measure (like how fast the car can go).
  • Decide where and how you’ll drive the car (which roads and conditions).
  • Pick the right tools (like a speedometer) to measure things accurately.
  • Set up a place that’s just like where you’ll usually drive (the environment).
  • Plan out exactly what you’ll do during the test drive (like driving at different speeds).
  • Get everything ready, including the car and the road.
  • Make sure you have all the tools and materials you need (like a map).
  • Start driving and record everything carefully (like how fast you’re going and any problems you notice).

13. How do you determine the workload for a performance test?


To determine the workload for a performance test:

  • Understand user profiles and their behaviors.
  • Collect usage data or historical patterns.
  • Define scenarios and account for peak loads, ensuring realistic simulation of user interactions during testing.

14. What is the difference between Benchmark Testing & Baseline Testing?


Benchmark Testing Baseline Testing

It is the method of comparing performance of your system performance against an industry standard that is set by other organization

It is the procedure of running a set of tests to capture performance information. When future change is made in the application, this information is used as a reference

15. What is response time in performance testing?


Response time encompasses various components, including:

  • Request Processing Time: The time taken to process the user’s request on the server-side, which includes database queries, business logic execution, and any other processing required to fulfill the request.
  • Network Latency: the amount of time it takes data to move between a user’s device and a server, influenced by factors like the distance between the user and the server and the quality of the network connection.
  • Client-Side Rendering: In web applications, this refers to the time it takes for the user’s browser to render and display the received content, including HTML, CSS, JavaScript, and rendering of images or multimedia elements.

16. What is throughput, and how is it measured?


To measure throughput during performance testing:

  • Define the Metric: Determine what you want to measure in terms of throughput. For example, you may want to measure the number of user login transactions per second or the number of HTTP requests processed per second.
  • Execute the Test: Conduct the performance test by simulating user interactions, transactions, or data transfers at varying levels of load or concurrency.
  • Monitor and Capture Data: Utilize performance testing tools and monitoring software to capture performance metrics, including throughput. The tools will record the number of successful transactions, requests, or data transfers completed per second.

 17. Why is monitoring essential during performance testing?


Monitoring during performance testing is like having a dashboard for your car while you’re driving. It shows you important information like how fast you’re going, how much gas you have, and if there are any problems. Similarly, during performance testing, monitoring tools show important information about how well a software system is working, helping testers spot and fix problems in real-time.

18. How do you identify performance bottlenecks?


To identify performance bottlenecks:

  • Gradually increase load while monitoring metrics.
  • Look for signs of performance degradation (e.g., increased response times).
  • Analyze resource utilization to find stressed components.
  • Use profiling and diagnostics to pinpoint code or database issues.
  • Isolate and confirm the bottleneck.
  • Optimize and retest.
  • Document findings and repeat testing regularly as the system evolves.

19. What should be included in a performance test report?


A performance test report should include:

  • Executive Summary.
  • Introduction and Test Objectives.
  • Test Environment Details.
  • Performance Metrics and Graphs.
  • Key Findings and Bottleneck Analysis Recommendations for Improvement.
  • Conclusion and System Assessment.
  • Lessons Learned.
  • Appendices (Raw Data, Scripts).
  • Glossary and References.
  • Contact Information.

20. Explain performance tuning and its significance.


Performance tuning is the process of making software and systems run faster and more efficiently. It’s crucial because it improves user experience, saves costs, and keeps systems reliable, competitive, and adaptable to growth while minimizing resource usage and environmental impact.

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    21. Name some common performance tuning techniques.


    Caching, load balancing, code optimization, database indexing, and hardware upgrades are commonly used techniques.

    22. What is performance testing, and why is it important?


    The term “performance testing” refers to a type of software testing. that assesses the speed, responsiveness, stability, and scalability of a software application or system under specific conditions and loads. It aims to ensure that the application can perform effectively and efficiently, meeting performance requirements and delivering a positive user experience.

    Performance testing is important for several reasons:

    • User Satisfaction: It helps ensure that the application responds quickly and reliably to user interactions, leading to higher user satisfaction and retention.
    • Reliability: Performance testing identifies and mitigates potential bottlenecks and stability issues, reducing the risk of system crashes or downtime.
    • Scalability: It assesses the system’s ability to handle growing user loads and increasing data volumes, allowing for effective scaling as the user base expands.
    • Cost Efficiency: Optimized performance reduces resource consumption, leading to cost savings, especially in cloud-based environments.
    • Competitive Advantage: High-performing applications are more attractive to users, giving organizations a competitive edge in the market.
    • Resource Efficiency: It ensures that system resources (CPU, memory, bandwidth) are used efficiently, extending hardware lifespan and reducing infrastructure costs.

    23. What are the common types of performance testing?


    Common types include load testing (checking under expected load), stress testing (testing system limits), and scalability testing (evaluating growth capacity).

    24. Why is performance testing so important for the creation of software?


    Performance testing is essential for software development because it ensures that an application can handle expected user loads, preventing crashes and slowdowns. It helps identify and rectify performance bottlenecks early in the development cycle, saving time and resources. Ultimately, it enhances user satisfaction and maintains the software’s reliability.

    25. Explain the key differences between open-source and commercial performance testing tools.


    • Cost: Open-source tools are typically free to use, while commercial tools require a license fee. This makes open-source options more accessible for small budgets.
    • Community vs. Support: Open-source tools rely on community support, which can be extensive but lacks guaranteed response times. Commercial tools offer dedicated customer support, ensuring quicker issue resolution.
    • Features and Scalability: Commercial tools often come with advanced features, reporting, and scalability options out of the box. Open-source tools may require additional customization and integration efforts.
    • Ease of Use: Commercial tools tend to have user-friendly interfaces and comprehensive documentation, making them easier for beginners. Open-source tools may have steeper learning curves.

    26. What are the steps involved in designing a performance test?


    • Define Objectives and Metrics: Clearly outline the test objectives, such as load, stress, or scalability testing, and establish performance metrics to measure success.
    • Identify Test Scenarios: Identify critical user interactions and workflows to simulate, including user loads, data volumes, and transaction rates.
    • Select Tools and Environment: Choose appropriate performance testing tools, set up the testing environment, and configure the necessary hardware, software, and network resources for accurate testing.

    27. How do you determine the workload for a performance test?


    • Understand User Behavior: Gather data or collaborate with stakeholders to understand typical user behavior, such as the number of concurrent users, their actions, and usage patterns.
    • Identify Peak Periods: Determine when the application experiences peak usage, which may vary based on factors like time of day, seasonality, or specific events.
    • Define Scenarios: Create test scenarios that replicate real-world user interactions, including different types of users (e.g., anonymous visitors, registered users) and their activities.
    • Calculate Workload: Calculate the workload by specifying parameters like the number of virtual users, the rate of transactions or requests per second, and the duration of the test.
    • Consider Future Growth: Account for anticipated growth in user numbers or usage patterns to ensure the system can handle future demands.
    • Vary Scenarios: Test under both expected and extreme scenarios (e.g., stress tests) to evaluate system performance under various conditions.

    28. In performance testing, what is response time?


    Response time in performance testing is the measurement of the time it takes for a system to respond to a specific user request or action, typically measured from the initiation of the request until the completion of the response. It is a critical metric to assess how quickly an application or service can provide feedback to users and directly impacts user experience. Monitoring and optimizing response times help ensure that a system meets performance expectations and user satisfaction.

    29. What is scalability testing, and why is it important?


    Scalability testing is a performance testing type that evaluates a system’s ability to handle increasing workloads, user loads, or data volumes while maintaining performance. It is essential to ensure that a software application or system can grow seamlessly with increasing demands, preventing bottlenecks, slowdowns, and system failures as user numbers or data loads expand. Scalability testing helps identify the system’s limits and allows for capacity planning to meet future requirements.

    30. Explain load testing and its purpose.


    Performance testing includes load testing that assesses a system’s behavior under expected and peak load conditions by simulating a predefined number of concurrent users or transactions. Its purpose is to measure and validate the system’s performance, responsiveness, and stability, ensuring it can handle user demands without crashing, slowing down, or experiencing errors. Load testing helps identify performance bottlenecks and capacity limitations, aiding in optimization and readiness for production use.

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     31. What is the goal of stress testing?


    Stress testing aims to determine the system’s breaking point and assess how it behaves under extreme conditions.

     32. What is scalability testing, and why is it essential?


    Scalability testing assesses a system’s ability to handle increased workloads or growing user demands while maintaining performance and responsiveness. It is essential to ensure that a software application or system can accommodate future growth without performance degradation or system failures, preventing costly disruptions and maintaining a positive user experience. Scalability testing identifies limitations and helps plan for resource scaling and infrastructure enhancements to support future requirements.

    33. What are performance testing tools used for?


    The performance testing tools used for automate the process of evaluating software application performance under various conditions, load levels, and scenarios. They help identify bottlenecks, measure response times, and provide valuable insights to optimize system performance and ensure it meets user expectations.

    34. What is a performance test script, and why is it important?


    A performance test script is a set of instructions defining the actions and transactions virtual users perform during a performance test, including requests, inputs, and timing. It’s important as it ensures consistency in test execution, allowing for the accurate measurement and comparison of system performance under different conditions, helping identify issues, and assess performance improvements.

    35. Why is workload modeling crucial in performance testing?

    Workload modeling is crucial in performance testing because it simulates realistic user behavior and system usage patterns, Assuring that tests appropriately reflect how the programme will be utilised in practise. This enables the identification of performance bottlenecks and ensures that the system can meet user expectations and requirements.

    36. Define transaction response time in performance testing.


    Transaction response time in performance testing is the duration it takes for a specific user action or transaction, such as submitting a form or accessing a webpage, to complete from the moment it’s initiated until the response is received. It is a critical metric for assessing system performance and user experience.

    37. What is throughput, and how does it relate to performance testing?

    Throughput in performance testing refers to the number of transactions, requests, or data processed by a system within a given time frame, typically measured in transactions per second (TPS) or requests per second (RPS). It’s a vital metric for evaluating a system’s capacity and performance, helping to determine its ability to handle user loads and meet performance expectations.

    38. What is root cause analysis in performance testing?


    Root cause analysis in performance testing is the process of identifying and addressing the underlying reasons for performance issues or bottlenecks within a software application or system. It involves investigating factors such as code inefficiencies, infrastructure problems, or configuration issues to pinpoint the exact cause of performance degradation and implement effective solutions for improvement.

    39. How can you determine the optimal user load for an application during testing?


    To determine the optimal user load for an application during testing, gradually increase the user load until performance metrics, such as response time or throughput, start degrading or meet predefined thresholds. The optimal user load is the point just before performance begins to degrade, indicating the system’s capacity limit under acceptable performance conditions.

    40. Explain the concept of code optimization in performance tuning.


    Code optimization in performance tuning involves modifying software code to make it more efficient, reducing resource consumption, and improving execution speed. It aims to eliminate bottlenecks, reduce response times, and enhance overall system performance by optimizing algorithms, reducing unnecessary computations, and minimizing memory usage.

    41. What is caching, and how can it improve performance?


    Caching refers to the temporary storing of frequently accessed data. material in order to speed up subsequent access. It improves performance by reducing the need to recompute or retrieve data from slower sources, such as databases or the internet, resulting in faster response times and reduced server load.

    42. Why should a system undergo scalability testing?


    Scalability testing is essential to ensure a system can handle increased user loads and data volumes while maintaining performance and reliability. It helps identify capacity limitations, plan for future growth, and avoid performance degradation or system failures as user demands expand.

    43. How does virtualization impact performance testing?


    Virtualization allows for the creation of isolated test environments, enabling performance testing in controlled, repeatable conditions. It facilitates the simulation of various user loads and configurations, making it easier to assess system behavior under different scenarios and identify performance bottlenecks.

    44. What challenges can you encounter when conducting performance testing in the cloud?


    Challenges in cloud-based performance testing include variable network latency, limited control over infrastructure, and cost management, as resources are billed based on usage. Ensuring consistent and reliable test results can be more complex when dealing with cloud environments.

    45. How does security testing relate to performance testing?


    Security testing focuses on identifying vulnerabilities and ensuring data protection, while performance testing assesses system responsiveness and scalability. Both are crucial aspects of software quality, and identifying security flaws during performance testing helps avoid potential security breaches under heavy loads.

    46. What function does performance testing serve in the continuous integration and testing (CI/CT)?


    Performance testing in CI/CT plays a vital role by automating the assessment of system performance throughout the development cycle. It assures that coding changes do not generate performance regressions, discovers issues early, and encourages engineers to provide faster feedback. This integration helps maintain application performance, scalability, and reliability in an agile development environment.

    47. Explain the importance of automation in performance testing.


    • Enables repetitive and complex tests to be executed consistently, reducing human error and ensuring accurate results.
    • Allows for the testing of various scenarios, user loads, and configurations, enhancing test coverage.
    • Facilitates continuous performance testing within CI/CD pipelines, providing timely feedback on code changes and ensuring early detection and resolution of performance issues. This ultimately leads to more reliable, scalable, and high-performing software applications. 

    48. What is database performance testing, and why is it essential?


    Database performance testing assesses how a database system handles queries, transactions, and data under varying loads, crucial for applications reliant on databases.

    49. Name common database performance issues and how to address them.


    Issues include slow queries, indexing problems, and high concurrency. Solutions involve query optimization, proper indexing, and database scaling.

    50. What metrics are typically measured in web performance testing?


    In web performance testing, typical metrics include:

    • Response Time: The time it takes to load a web page or execute a transaction.
    • Throughput: The number of requests or transactions processed per second, indicating the system’s capacity.
    • Error Rate: The percentage of failed or erroneous requests.
    • Resource Utilization: CPU, memory, and network usage.
    • Page Load Time: The time it takes for a web page to fully render in the browser.
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    51. Explain the impact of client-side scripting (JavaScript) on web performance.


    Client-side scripting, such as JavaScript, can impact web performance by:

    1. Increasing page load times as browsers must download, parse, and execute JavaScript code.
    2. Introducing potential bottlenecks and rendering delays if not optimized, affecting user experience and page responsiveness.

    52. Why is mobile performance testing important for mobile applications?


    It ensures that mobile apps function smoothly, load quickly, and provide a positive user experience across different devices and network conditions.

    53. What are some challenges in mobile performance testing?


    Challenges include testing on various devices, operating systems, and network conditions, as well as handling different screen sizes and resolutions.

    54. Explain the role of network latency in performance testing.


    Network latency, or delays in data transmission, can significantly impact application performance, especially in distributed systems.

    55. How can you simulate network latency in performance testing?


    Network simulation tools and settings can introduce controlled latency to test system behavior under slow or unreliable network conditions.

    56. What is API performance testing, and why is it important?


    API performance testing assesses the speed and efficiency of interactions between software components, ensuring robust system integration.

    57. What are some key performance metrics for API testing?


    Metrics include response times, throughput, error rates, and resource consumption during API interactions.

    58. What is the difference between JMeter and SOAPUI?


    JMeter SoapUI

    It is used for load and performance testing

    HTTP, JDBC, JMS, Web Service(SOAP), etc.

    It is specific for web services and has

    a more user-friendly IDE

    It supports distributed load testing It does not support distributed load testing

    59.Explain the advantages of conducting performance testing in a cloud environment.


    Cloud-based testing offers scalability, flexibility, and the ability to simulate real-world scenarios, making it suitable for performance testing.

    60. What factors should be considered when selecting cloud resources for performance testing?


     Consider factors such as instance types, regions, network configuration, and cost management to optimize cloud-based testing.

    61. What are some best practices for effective performance testing?


    Best practices include setting clear objectives, using realistic test data, scripting efficiently, and monitoring comprehensively.

    62. How can you simulate realistic user behavior in performance testing?

    Realistic user behavior can be simulated by analyzing user journeys, including navigation paths and interaction patterns.

    63. Why is it important to have a test environment that closely resembles the production environment?


    A similar test environment ensures accurate performance testing results, as it reflects real-world conditions and challenges.

    64. What are the key components of a performance test environment?


    Components include the application servers, database servers, network infrastructure, and monitoring tools.

    65. How do you generate load for performance testing?


    Load is generated using virtual users or agents that simulate user interactions by sending requests to the application.

    66. What is the purpose of ramp-up and ramp-down in load testing?


    Ramp-up gradually increases the user load, and ramp-down decreases it, mimicking real-world user patterns during a test.

    67. What are performance test scenarios, and why are they important?


    Scenarios represent different user activities and load patterns, allowing testers to assess various aspects of system performance.

    68. Explain the difference between a baseline and a benchmark in performance testing.

    A baseline represents the system’s performance under normal conditions, while a benchmark is a standard for comparison, often based on industry standards or competitors’ performance.

    69. What is the purpose of performance metrics in testing?


    Performance metrics provide quantifiable data on system behavior, helping identify issues and make informed decisions.

    70. Name some common performance metrics measured during testing.

    Metrics include response time, throughput, error rate, CPU utilization, memory usage, and network latency.

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    71. What challenges may arise when executing performance tests?


    Challenges include resource constraints, test data generation, test environment setup, and handling external dependencies.

    72. How can you address the challenge of simulating realistic data in performance tests?


    Generate test data that mimics production data, including various data types, volumes, and scenarios.

    73. How can performance testing be integrated into Agile and DevOps methodologies?

    Performance testing can be automated, integrated into CI/CD pipelines, and conducted continuously to catch issues early in the development process.

    74. What is shift-left testing, and how does it relate to performance testing?


    Shift-left testing involves moving testing activities earlier in the development cycle, allowing performance testing to be conducted sooner.

    75. How can external factors like network conditions impact performance testing results?


    Variations in network conditions can affect response times and throughput, making it crucial to account for them in testing.

    76. What is the purpose of geographical testing, and how is it performed?


    Geographical testing assesses how an application performs from different locations. It’s done by using load generators from various geographic regions.

    77. Explain the role of APM (Application Performance Monitoring) tools in performance testing.


    APM tools provide real-time insights into application performance, helping identify bottlenecks during testing.

    78. What is the purpose of load balancers in performance testing?


    Load balancers distribute incoming traffic evenly across multiple servers, ensuring even workload distribution during testing.

    79. What is the role of test data in performance testing, and how is it managed?


    In order to imitate real-world situations, test data is used. It must be carefully managed, ensuring data privacy, integrity, and variety.

    80. Explain the importance of data anonymization in performance testing.


    Data anonymization protects sensitive information while allowing realistic testing scenarios to be created.

    81. What is a soak test, and why is it conducted?

    A soak test assesses system stability over an extended period under a sustained load to identify memory leaks and resource exhaustion.

    82. How do you approach spike testing, and what does it test?


    Spike testing assesses how a system handles sudden, extreme increases in user load, testing its resilience under unexpected spikes in traffic.

    83. What are non-functional requirements (NFRs) in performance testing?


    NFRs specify criteria related to performance, security, usability, and other non-functional aspects that an application must meet.

    84. Explain the concept of Service Level Agreements (SLAs) in performance testing.


    SLAs define performance expectations, such as response times and uptime, that an application or system must adhere to.

    85. What is production monitoring, and how does it relate to performance testing?


    Mitigate risks by conducting tests in off-peak hours, isolating test traffic, and having rollback plans in place.

    86. Explain the specific considerations for performance testing in e-commerce applications.


    E-commerce applications require testing under various load conditions, considering factors like shopping cart usage and payment processing.

    87. What are the key challenges in performance testing for financial applications?


      Challenges include handling high transaction volumes, ensuring security, and complying with strict regulatory requirements.

    88. What are some API-specific performance metrics to measure?


     API metrics include response time, throughput, error rates, and the number of API calls per second.

    89. How can you ensure the reliability and scalability of APIs in performance testing?


    Test APIs under different user loads and conditions to verify they can handle expected usage patterns.

    90. Explain the challenges of performance testing in a microservices-based architecture.


    Challenges include handling distributed systems, orchestrating tests across services, and monitoring inter-service communication.

    91. What tools or practices can be helpful for performance testing in microservices architectures?


    Tools like Docker and Kubernetes can assist in deploying and managing microservices for testing, while distributed tracing tools help monitor inter-service communication.

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