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Performance testing
What is performance testing?
Performance testing is the category of software testing that evaluates how a system behaves under a given workload. Functional testing checks whether a system does the right thing. Performance testing checks whether it does it fast enough, reliably enough, and at the scale you actually need.
It covers several subtypes, each answering a different question. Load testing measures behavior under expected levels of concurrent usage. Stress testing pushes past normal limits to find where things break. Soak testing watches for stability over long periods, catching slow memory leaks. Spike testing examines what happens under sudden, sharp jumps in traffic, the kind a retailer sees the moment a flash sale goes live and ten thousand people hit checkout at once. The metrics that matter throughout are response time, throughput, error rate, and resource utilization across CPU, memory, and network, all measured against defined performance requirements or service level agreements.
This work matters most for applications that serve large numbers of concurrent users, process high volumes of data, or have to meet strict response-time targets. A system can pass every functional test and still fall over the first time real traffic arrives, which is exactly the failure performance testing exists to catch before users do.
Performance testing at Dallonses
We build performance testing into the delivery process rather than saving it for a panic before launch. As part of our CI/CD pipelines, we measure how a system holds up under realistic load, so a regression that slows a key page down shows up in a pull request, not in production on the busiest day of the year. Software validation is part of the work, not an afterthought bolted on at the end.
We also keep the targets honest. Performance numbers only mean something against real expectations, so we set them with clients based on how the product will actually get used: peak traffic, data volumes, response times that matter to the people on the other end. When a system needs to hold up under pressure, we make sure it does before that pressure is real.
Need to know your system will hold up before real traffic finds out for you? Let's put it to the test.
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