Performance and load testing guides — measure, benchmark, and optimize your app before it hits production.
Testing
k6 is the go-to tool for modern stress and load testing. It uses JavaScript for test scripts, outputs structured metrics, and integrates cleanly with CI/CD pipelines. This guide focuses specifically on stress testing patterns — how to ramp up load, detect breaking points, and extract actionable data from the
Testing
Spike testing simulates sudden, dramatic traffic increases — a product launch going viral, a flash sale, or a marketing email hitting millions of inboxes simultaneously. Unlike stress testing (which ramps gradually), spike testing applies an immediate, extreme load increase to test instantaneous system response. Gatling is one of the best tools
Testing
Database layers fail in ways that application layers don't. HTTP servers can scale horizontally almost indefinitely — databases hit hard limits around connections, lock contention, and I/O capacity. Stress testing the database independently from the application reveals bottlenecks that composite API tests often miss. Why Database Stress Testing
Testing
Multi-tenant SaaS applications are among the most complex systems to test correctly. A single deployment serves dozens, hundreds, or thousands of customers simultaneously — each expecting their data to remain private, their configuration to behave independently, and their performance to be unaffected by noisy neighbors. When isolation breaks down, the
Unity
Unity's Test Framework goes far beyond simple [Test] attributes on edit-mode assertions. Once your game reaches production complexity — async systems, multi-scene architectures, physics-driven gameplay — you need play mode tests that run inside the engine loop, performance benchmarks that catch frame-rate regressions, and a CI
Test Automation
The most realistic test data you will ever have is the traffic that hits your production service right now. Real users make requests with edge-case inputs, unusual character sets, unexpected header combinations, and query patterns that no test author would ever think to write. GoReplay (gor) is an open-
WebAssembly
WebAssembly is fast — often within 10–20% of native performance — but "fast" is relative. Whether your Wasm module is fast enough depends on the baseline, the workload, and the runtime. Benchmarking Wasm requires measuring both the Wasm execution and comparing it against native, and tracking performance over time
Game Testing
Performance is the most common reason games get negative reviews on mobile and PC. "Unplayable on my device," "terrible framerate," "game crashes after 20 minutes." Most of these issues are detectable before release with systematic performance testing. Frame Rate Testing Defining Performance Targets Before
Testing Tools
Load testing tools have different philosophies about how you define tests, what protocols they support, and how results are presented. k6, JMeter, and Locust are the three most widely used open-source options. Each has legitimate reasons to exist. This guide cuts through the marketing to help you pick the
5G
5G promises sub-millisecond latency for URLLC (Ultra-Reliable Low Latency Communications) use cases — remote surgery, autonomous vehicles, industrial automation. Testing applications that depend on these guarantees requires different tools and strategies than traditional web performance testing. This guide covers how to validate low-latency requirements, simulate 5G network conditions,
Testing Strategy
Netflix's infrastructure team had a problem in 2010: they couldn't be sure their systems would survive an AWS outage. Their solution — a tool that randomly terminates production instances — became Chaos Monkey, and the discipline around it became chaos engineering. The core idea: instead of hoping your
Testing Tools
Gremlin is a commercial chaos engineering platform that simplifies running controlled failure experiments at scale. Where open-source tools like Chaos Mesh require Kubernetes expertise to operate, Gremlin provides a web UI, pre-built attack scenarios, and team collaboration features. This tutorial covers setup, running your first experiments, and building