Best of Load Testing — 2025

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   Article

   AppSignal·51w

   Performance and Stress Testing in Node.js

   Performance and stress testing are crucial for Node.js applications to evaluate system behavior under normal and extreme traffic conditions. Performance testing assesses responsiveness and scalability under expected loads, while stress testing pushes systems beyond normal capacity to identify breaking points. These tests are essential for Node.js due to its asynchronous model, scalability limitations, and resource utilization patterns. The article compares three popular testing tools: AutoCannon (Node-based HTTP benchmarking), Artillery (cloud-native distributed testing), and k6 (developer-friendly with JavaScript scripting). A practical tutorial demonstrates setting up performance tests using AutoCannon with a simple Node.js server, including installation, test execution, and result analysis.

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   Article

   NVIDIA Developer·39w

   How to Scale Your LangGraph Agents in Production From A Single User to 1,000 Coworkers

   NVIDIA shares their approach to scaling LangGraph AI agents from single-user prototypes to production systems supporting 1,000+ concurrent users. The process involves three key steps: profiling single-user performance to identify bottlenecks, conducting load tests to estimate hardware requirements, and implementing monitoring during phased rollouts. Using the NeMo Agent Toolkit, they deployed an internal AI-Q research agent, discovering critical issues like CPU misconfiguration and timeout handling that only emerged under load. The methodology includes evaluation tools, sizing calculators, and OpenTelemetry integration for comprehensive observability.

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3. 3
   Article

   Software Testing Magazine·30w

   Free Load Testing Tools & Services

   A comprehensive comparison of free load testing tools and services available in 2025. Covers 10 platforms including Blazemeter, Grafana Cloud k6, Loader.io, and others, detailing their limitations on concurrent users, test duration, and features. Each service offers different constraints on virtual users (ranging from 10 to 50), test durations (30 seconds to 20 minutes), and capabilities. Most tools are JMeter-compatible and cloud-based, designed for testing web applications, APIs, and mobile apps under simulated user load from multiple geographic locations.

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