Definition
Load Testing
Simulating realistic user traffic against your application to identify performance bottlenecks and failure points before real users hit them.
Load testing uses tools like k6, Locust, or Artillery to simulate hundreds or thousands of concurrent users hitting your application. The goal is to find the breaking points — where response times degrade, where errors spike, where the database chokes — before your real users discover them. Load testing reveals issues invisible in development: N+1 queries that are fine with 10 records but catastrophic with 10,000, missing database indexes, connection pool exhaustion, and memory leaks that only appear under sustained traffic. For any application expecting growth, load testing is essential before launch.
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