Top 30 Performance Testing Interview Questions and Answers 2025

PT can be tested at load condition by applying the load and measuring the voltage and current.

• Apply the load to the PT

• Measure the voltage and current using appropriate instruments

• Calculate the power factor and accuracy of the PT

• Ensure that the PT is within the acceptable limits of error

• Repeat the test at different load conditions to ensure accuracy

Performance testing is the process of evaluating the speed, responsiveness, stability, and scalability of a software application.

• It involves simulating real-world scenarios to measure the application's performance under different loads.

• JMeter is a popular open-source tool used for performance testing.

• It can be used to test web applications, APIs, and databases.

• JMeter allows testers to create and execute test plans, generate reports, and analyze results.

• Performance testing hel...read more

Performance testing focuses on evaluating the speed, responsiveness, and stability of a system, while performance engineering involves optimizing the system for better performance.

• Performance testing is a subset of performance engineering.

• Performance testing measures the system's performance under specific conditions.

• Performance engineering includes analyzing, designing, and implementing improvements to enhance performance.

• Performance testing identifies bottlenecks and issues...read more

Performance testing involves evaluating the speed, responsiveness, and stability of a system under various conditions.

• Performance testing is used to identify bottlenecks, assess system capacity, and ensure reliability.

• It involves simulating real-world scenarios to measure the system's response time, throughput, and resource utilization.

• Performance engineering focuses on optimizing system performance through design, development, and testing.

• Common tools for performance testing...read more

Pacing and think time are important concepts in performance analysis, related to the speed at which a user interacts with a system and the time they spend thinking or processing information.

• Pacing refers to the speed at which a user interacts with a system, including how quickly they navigate through screens or complete tasks.

• Think time is the amount of time a user spends processing information, making decisions, or simply pausing during their interaction with a system.

• Unders...read more

Performance test of elastomeric bearings evaluates their ability to withstand load, deformation, and environmental conditions.

• Performance test assesses the load-carrying capacity of elastomeric bearings.

• It measures the deformation and displacement under different loads.

• Tests evaluate the behavior of bearings under various environmental conditions like temperature and moisture.

• Performance tests ensure the durability, stability, and functionality of elastomeric bearings.

• Example...read more

Performance testing helps identify bottlenecks, optimize system performance, and ensure reliability under different load conditions.

• Identify performance bottlenecks in the system

• Optimize system performance to improve user experience

• Ensure system reliability under different load conditions

• Validate scalability of the system

• Helps in determining the maximum capacity of the system

• Identify potential issues before they impact end users

Passion for optimizing software performance and ensuring user satisfaction.

• Enjoy analyzing system behavior under load

• Passionate about optimizing software performance

• Fascinated by the impact of performance on user experience

Unit testing is a method to test individual components of software, while performance testing evaluates system performance.

• Unit testing focuses on testing individual units or components of software to ensure they function correctly.

• It helps identify bugs or errors in the code early in the development process.

• Unit tests are typically written by developers and executed frequently during development.

• Performance testing measures the performance and responsiveness of a software sy...read more

Load calculation can be done by measuring the power consumed by the load and dividing it by the voltage supplied.

• Measure the power consumed by the load using a wattmeter

• Divide the power by the voltage supplied to get the load in amperes

• Use the formula P=VI to calculate the power consumed by the load

• Consider the power factor of the load while calculating the load

We use JMeter for monitoring performance testing.

• We use JMeter to simulate load on our system and monitor its performance.

• JMeter provides various performance metrics like response time, throughput, and error rate.

• We analyze the results from JMeter to identify bottlenecks and optimize performance.

• JMeter allows us to create and execute performance test scripts for different scenarios.

Performance testing focuses on speed, scalability, and stability of the system, while functional testing checks if the system meets specified requirements.

• Performance testing evaluates the system's speed, scalability, and stability under various load conditions.

• Functional testing verifies if the system meets specified requirements and functions correctly.

• Performance testing helps identify bottlenecks and optimize system performance.

• Functional testing ensures that the system b...read more

Performance of BI Report can be checked by analyzing response time, data accuracy, user feedback, and system resource usage.

• Analyze response time to ensure reports load quickly

• Verify data accuracy by comparing with source data

• Collect user feedback to identify any issues or improvements needed

• Monitor system resource usage to ensure optimal performance

Factors for selecting Performance Testing tools include compatibility, scalability, ease of use, cost, and support.

• Compatibility with the technology stack being used

• Scalability to handle the expected load

• Ease of use for testers to create and execute tests

• Cost of the tool compared to the budget

• Availability of support and documentation

• Integration capabilities with other testing tools

• Reporting and analysis features

• Community support and user reviews

Baseline is the starting point of performance measurement while benchmark is the standard for comparison.

• Baseline is the initial measurement of performance used as a reference point for future comparisons.

• Benchmark is the standard or best practice used for comparison with the current performance.

• Baseline and benchmark are used to measure and improve performance.

• For example, a company may set a baseline for their website's loading time and use industry benchmarks to compare an...read more

Requirement gathering in performance testing involves identifying the performance goals and objectives of the system under test.

• Identify the performance goals and objectives of the system under test

• Understand the user load and usage patterns

• Determine the response time and throughput requirements

• Identify the hardware and software configurations

• Define the test environment and data requirements

• Collaborate with stakeholders to gather requirements

• Document the requirements for futu...read more

Benchmark is a standard or point of reference used for comparison or evaluation.

• Benchmark is used to measure the performance of a product, service, or investment against a standard.

• It helps in identifying strengths and weaknesses and improving performance.

• Examples of benchmarks include stock market indices, interest rates, and industry-specific metrics.

• Benchmarking can be internal (comparing performance within an organization) or external (comparing performance with competito...read more

Concurrent user count in performance testing can be tested by simulating multiple users accessing the system simultaneously.

• Create scripts to simulate multiple users accessing the system at the same time

• Use load testing tools like JMeter or LoadRunner to generate concurrent user traffic

• Monitor server response times and errors under different user load scenarios

• Analyze the performance metrics to identify bottlenecks and optimize system performance

There are three types of benchmarks in civil engineering: primary, secondary, and tertiary.

• Primary benchmarks are permanent reference points with known elevations.

• Secondary benchmarks are temporary points established for a specific project.

• Tertiary benchmarks are intermediate points used for leveling between primary and secondary benchmarks.

• Examples of primary benchmarks include survey monuments and geodetic control points.

• Examples of secondary benchmarks include construction...read more

Aggregate report is a summary of performance test results showing key metrics like average response time, throughput, error rate, etc.

• Aggregate report provides a high-level summary of performance test results

• It includes metrics like average response time, throughput, error rate, and percentiles

• Helps in identifying performance bottlenecks and areas for improvement

• Commonly used in tools like JMeter to analyze performance test results

Benchmarking is a process of comparing performance metrics, practices, or products against industry standards or competitors.

• Identify the metrics or practices to be benchmarked

• Research and gather data on industry standards or competitors' performance

• Analyze the data and identify gaps or areas for improvement

• Implement changes or improvements based on the benchmarking results

• Continuously monitor and update benchmarks to stay competitive

Performance testing focuses on evaluating the speed, responsiveness, and stability of a system under a specific workload, while capacity testing assesses the system's ability to handle a certain level of traffic or data volume over time.

• Performance testing measures the speed, responsiveness, and stability of a system under a specific workload.

• Capacity testing evaluates the system's ability to handle a certain level of traffic or data volume over time.

• Performance testing helps...read more

Performance test cycle involves planning, designing, executing, analyzing, and optimizing performance tests.

• Planning phase involves defining objectives, selecting tools, and creating test scenarios.

• Design phase includes setting up test environment, configuring tools, and preparing test data.

• Execution phase involves running tests, monitoring performance metrics, and collecting results.

• Analysis phase includes identifying bottlenecks, analyzing performance data, and generating r...read more

Types of performance testing in machine learning include cross-validation, hyperparameter tuning, and model evaluation metrics.

• Cross-validation: Splitting the data into multiple subsets to train and test the model on different combinations.

• Hyperparameter tuning: Adjusting the parameters of the model to optimize performance.

• Model evaluation metrics: Using metrics like accuracy, precision, recall, and F1 score to evaluate the model's performance.

Different types of performance tests include load testing, stress testing, spike testing, and endurance testing.

• Load testing: Simulates expected load on the system to measure performance.

• Stress testing: Pushes the system beyond its limits to identify breaking points.

• Spike testing: Tests how the system handles sudden spikes in traffic.

• Endurance testing: Checks system performance over an extended period of time.

Performance testing is a type of testing that measures the speed, responsiveness, stability, and scalability of a software application.

• It involves simulating real-world scenarios to identify bottlenecks and areas for improvement.

• Performance testing can be done at different stages of the software development life cycle.

• Examples of performance testing tools include JMeter, LoadRunner, and Gatling.

• Performance testing can help ensure that an application can handle a large number ...read more

Performance testing procedures for API involve load testing, stress testing, and scalability testing.

• Conduct load testing to determine how the API performs under normal and peak load conditions.

• Perform stress testing to evaluate the API's stability and reliability under extreme conditions.

• Conduct scalability testing to assess the API's ability to handle increased workload by adding more resources.

• Monitor response times, throughput, and error rates during testing to identify p...read more

Run test and performance test parameters are essential for evaluating system performance.

• Run test measures how a system performs under normal conditions.

• Performance test evaluates system performance under stress or heavy load.

• Parameters include response time, throughput, CPU usage, memory usage, etc.

• Examples of tools for performance testing: JMeter, LoadRunner, Apache Bench.

I have experience in conducting load testing, stress testing, and scalability testing.

• Load testing to assess the system's ability to handle a specific load

• Stress testing to evaluate the system's behavior under extreme conditions

• Scalability testing to determine the system's ability to scale up or down based on demand

I have tested performance using JMeter by creating test plans, configuring thread groups, adding samplers, setting up listeners, and analyzing results.

• Created test plans in JMeter to simulate real-world scenarios

• Configured thread groups to define the number of users and iterations

• Added samplers to send requests to the server under test

• Set up listeners to view and analyze the test results

I handled performance testing end to end by conducting thorough analysis, creating test plans, executing tests, analyzing results, and implementing optimizations.

• Conducted thorough analysis to identify key performance metrics and testing requirements

• Created detailed test plans outlining scenarios, tools, and success criteria

• Executed tests using appropriate tools and techniques, monitoring system behavior and performance

• Analyzed test results to identify bottlenecks, performanc...read more

View Result Tree is a listener in JMeter that displays the results of performance tests in a tree format.

• View Result Tree is used to view the response data, request and response headers, and other details of each sample in a performance test.

• It can be used to debug issues in the test script by analyzing the details of each request and response.

• View Result Tree can also be used to view and analyze the performance metrics such as response time, latency, and throughput.

• It is a u...read more

Performance testing helps identify bottlenecks, optimize system performance, and ensure reliability under different conditions.

• Identifies bottlenecks in the system that may impact performance

• Optimizes system performance by identifying areas for improvement

• Ensures reliability under different conditions by simulating real-world scenarios

• Helps in capacity planning by determining the maximum load the system can handle

• Reduces the risk of system failures and downtime during peak us...read more

JMeter tools offer several advantages for engineers.

• JMeter allows engineers to perform load testing and measure the performance of web applications.

• It supports multiple protocols such as HTTP, FTP, JDBC, SOAP, and more.

• Engineers can create and execute test plans with various configurations and parameters.

• JMeter provides real-time reporting and analysis of test results.

• It offers distributed testing capabilities to simulate high user loads.

• JMeter is open-source and has a large ...read more

To convince the client about performance testing, emphasize its benefits and provide examples of how it can improve their product.

• Explain the importance of performance testing in ensuring the product meets performance requirements and user expectations.

• Highlight the potential risks of not conducting performance testing, such as poor user experience, system crashes, and loss of customers.

• Share success stories or case studies where performance testing identified and resolved cr...read more