What exactly does performance test measure?

A performance test measures how well software performs under specific conditions. This includes metrics like response time (how long it takes to respond to a request), throughput (how many requests it can handle per second), CPU usage, memory consumption, and stability. It simulates real-world usage patterns to ensure the application meets speed and efficiency requirements.

How is performance testing different from functional testing?

Functional testing checks whether features work correctly (do the buttons do what they should?). Performance testing checks whether they work fast and efficiently (can the system handle 1,000 users simultaneously without slowing down?). You need both types before releasing software.

When should you run a performance test?

Performance tests should run before major releases, after significant code changes, and when adding new features that might impact system resources. They typically happen in a staging or testing environment that mimics production conditions, not in production itself.

What tools do engineers use for performance testing?

Common tools include JMeter, LoadRunner, Gatling, and k6. These tools can simulate thousands of virtual users, generate load on the system, and monitor performance metrics in real time.

Is performance test formal or informal language?

Performance test is neutral, professional language used in both formal documentation and casual workplace conversations. It is the standard term used in tech companies worldwide.

performance test meaning in tech

Commonness	4/5
Versatility	4/5
Formality	CasualFormalNeutral
Spoken ↔ Written	SpokenWrittenBoth
Directness ↔ Diplomatic	DirectDiplomaticDirect
Region	US and UK

Say it like this

✓We need to performance test this under load.

✓The performance test revealed some serious bottlenecks.

✓Once the performance test passes, we can ship it.

Real examples

in a standup

"We completed the performance test yesterday and found that the database queries need optimization."

in a code review

"This change looks good, but we should performance test it with at least 10,000 concurrent users before merging."

in a team meeting

"The performance test results show that our new feature can handle 5,000 requests per second, which exceeds our requirements."

Don't say this

Handle with care. Do not confuse with functional testing. Performance testing measures speed and efficiency under load, not whether features work correctly.

✕We performance tested the feature and it works great.

✓We ran a performance test on the feature and the results look good.— Performance test is usually a noun; use 'run a performance test' or 'conduct a performance test' rather than as a verb.

✕Performance testing shows the app works correctly.

✓Performance testing shows the app responds quickly under load.— Performance testing measures speed and efficiency, not functional correctness. Use functional testing or unit tests for that.

✕We do performance test every day.

✓We run performance tests before each release.— Performance tests are typically run periodically before releases, not constantly, due to their resource intensity.

Other forms

noun

performance test

"The performance test revealed that our server could only handle 500 concurrent users."

noun

performance testing

"Performance testing is essential before any major release to production."

verb

run/conduct a performance test

"We ran a performance test on the new API and found response times to be acceptable."

Often used with

run a performance testMost common verb phrase meaning to execute or conduct the test.

performance test resultsThe data and findings from the test, often presented in reports.

performance test environmentThe dedicated setup where tests are conducted, separate from production.

performance test metricsThe specific measurements like response time, throughput, and CPU usage.

load performance testTesting how the system performs under heavy user load.

Similar words

load testOverlapping term that specifically focuses on how the system handles increased traffic.

stress testTests the system beyond normal capacity to find breaking points; more extreme than performance testing.

benchmark testMeasures performance against a standard or baseline for comparison purposes.

Opposites

functional testunit test

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your manager asks about testing the new payment system before launch. What do you say?

We need to run a performance test on the payment system first.We need to do a performance test with the payment system.We need to make a performance test for the payment system.We need to performance test the payment system.

Complete the sentence

2. Before shipping to production, the QA team must _______ on our database to check response times.

Spot the mistake

3. Which sentence uses performance test correctly?

We ran a performance test and confirmed the feature is functional.We ran a performance test and confirmed the API can handle 10,000 requests per second.Performance testing verifies that all buttons on the page work.The performance test shows the code is written correctly.

Rewrite naturally

4. Rewrite this using performance test: 'Before we release this to users, we need to check how fast it runs when many people use it at the same time.'

Questions

Quick poll

Have you said "performance test" in a standup this week?

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