Concurrent Users
Performance
// Definition
The number of users actively interacting with the system at the same moment. A primary input to load and stress test design.
// Related terms
Load Testing
Verifying system behaviour under expected production load. Confirms the application meets performance targets at typical concurrent-user counts before release.
Throughput
The amount of work completed per unit of time — requests per second, transactions per second. Higher is better.
Stress Testing
Pushing the system beyond its limits to find the breaking point and observe failure modes. Asks: where does this fall over, and how does it recover?
Learn more · Performance Testing with K6
Chapter 2 · Lesson 3: Virtual Users (VUs) and Iterations