WebSocket Load Testing With k6 and JMeter, Tested
WebSocket load testing with k6 and JMeter, tested: 2,000 open sockets, refused handshakes that still exit 0, and a timeout that shifts every later JMeter reply.
Load Testing
Load testing guides explain what a performance test measures and how to read the result. You'll find what response time, throughput, hits per second, percentiles and standard deviation mean, how stress, spike, volume and disaster recovery tests differ, which metrics to watch during a run, and practical fixes such as gzip on NGINX for a site that slows under load.
62 articles
k6 Checks: Assertions, Thresholds and Exit Codes
k6 checks explained with real runs: 66% failed checks still exited 0, one check name can carry its own threshold, and a check that throws ends the iteration.
k6 Stress Test: Scripts, Breaking Points and Recovery
How to write a k6 stress test, with real runs: a ramping-vus test passed at 4x load with 0% errors, while an arrival-rate test at 2x capacity failed 50%.
Load Balancer Testing: 6 Checks, Run Against nginx
Load balancer testing with real runs: one hung backend stopped all traffic for 30 s while k6 reported 0% errors. Six checks and how to run each one.
k6 Reports: Summary, JSON, CSV and HTML Dashboard
k6 report formats tested on v2.3.0: the end-of-test summary, JSON and CSV output, handleSummary, and the HTML dashboard export k6 skipped on a 19-second run.
k6 TypeScript: Run .ts Load Tests Without a Build Step
k6 runs .ts files directly since v0.57, but it strips types without checking them. 11 TypeScript cases tested on k6 v2.3.0, and the decorators that hung it.
k6 Scenarios: Executors, Sequencing and Thresholds
k6 scenarios explained with real runs: all 6 executors, startTime chaining, per-scenario thresholds, and a rate test that dropped 686 of 1,001 iterations.
hey Load Testing: A Tutorial With Real Output
hey load testing tutorial: install hey, read its report, send POSTs with tokens, and avoid the exit code 0 that hides failed runs. Tested on hey 0.1.5.
Performance Testing Interview Questions and Answers
Performance testing interview questions with answers: test types, metrics, Little's Law, workload models, bottlenecks, and 4 scenarios, with real test numbers.
wrk Load Testing: A Benchmark Tutorial With Real Output
wrk load testing tutorial: install wrk, read its output, send POSTs with Lua, and avoid the 2-second timeout that hides slow responses. Tested on wrk 4.2.0.
Apache Bench (ab): A Load Testing Tutorial With Real Output
Apache Bench tutorial: install ab, run a test, read every output line, send POSTs and headers, and avoid the -t 50,000 cap. Tested on ab 2.3 with real output.
Vegeta Load Testing: A Tutorial With Real Output
Vegeta load testing step by step: install, attack at a fixed rate, write targets files, read reports, ramp up and gate CI. Tested on 12.13.0 with real output.
Artillery Load Testing: A YAML Tutorial With Real Output
Artillery load testing step by step: install, write a YAML script, set arrival phases, read results, fail CI on a threshold. Tested on 2.0.34, 1,120 requests.
Gatling Load Testing: A Java Tutorial With Real Output
Gatling load testing step by step: set up Maven, write a Java simulation, inject users, read the report, fail the build on assertions. Tested on 3.16.0.
Locust Load Testing: A Python Tutorial With Real Output
Locust load testing step by step: install, write a locustfile, run headless, read the stats and shape the load. Tested on Locust 2.47.0 with 1,026 requests.
Guide to Load Testing Event-Driven Systems 2026
Load test event-driven systems by injecting events at the producer and measuring at the consumer: end-to-end latency, consumer lag, DLQ rate, duplicates.
Optimize Database Connection Pools for Peak Performance
Size a database connection pool from the database's limits, then confirm it with a load test. Defaults and limits from HikariCP, PgBouncer and PostgreSQL docs.
Load Test Script Maintenance: What AI Can and Cannot Do
Load test scripts break when APIs, auth, dynamic values or data change. How to detect drift early, keep scripts in git, and what AI can and cannot do.
Effective Load Testing for SaaS Onboarding
Learn effective SaaS onboarding testing techniques to create load testing scenarios that enhance user experience and ensure smooth performance.
Configure OAuth2 Load Testing for APIs
Learn how to configure OAuth2 load testing for APIs to ensure secure and accurate performance under stress. Improve your API testing process today.
Challenges in IoT Load Testing & Solutions 2026
IoT load testing for MQTT and CoAP backends: connections, keepalive, reconnect storms and retained messages, plus the tools that can generate that load.
Cloud vs On-Premise Load Testing: 2026 Guide
Cloud or on-premise load testing? Answer five questions in order, then confirm with a two-run pilot. Links the startup, enterprise and monitoring guides.
Guide to Load Testing Multi-Tenant SaaS Applications (2026)
Load testing multi-tenant SaaS: model the tenant mix, test noisy neighbours and per-tenant rate limits, check data isolation, and read results per tenant.
Design Load Tests for Progressive Web Apps 2026
Design load tests for progressive web apps: what service workers hide from a load test, and how to test cold-cache visits, offline sync bursts and push sending.
Boosting E-Commerce Checkout Speed at Peak Load
How to keep checkout fast at peak load: measure each step, find the slow query or call, and test with a ramp that matches a sale. Includes a k6 sketch.
Scripted vs AI-Driven Load Testing: 2026 Insights
Explore scripted vs AI-driven load testing approaches. Learn strengths, limitations, and decision criteria for 2026 performance optimization.
Top 7 Network Protocols Every Tester Must Know in 2026
Seven protocols load testers meet in 2026 (HTTP/1.1, HTTP/2, HTTP/3, WebSocket, gRPC, MQTT, SQL), what a test measures for each, and which tools support them.
Identify and Fix Memory Leaks in Load Testing
How to find memory leaks in a load test: hold a steady load for hours, trend the heap left after each GC, diff two heap dumps, fix the reference and re-run.
Load Testing for Media Streaming Performance
How to load test a video streaming platform: what to simulate, how to model a live-event audience, a k6 sketch, and how to read the results.
What is Endurance Testing (Soak Testing)?
Endurance testing and soak testing are the same practice: normal load held for hours. What it catches, how long to run it, and how to read the trend.
What is Spike Testing in Performance Testing?
Spike testing applies traffic suddenly instead of ramping. Why autoscaling and cold caches fail in that window, and why recovery is half the test.
What is Volume Testing in Software Testing?
Volume testing increases the data a system holds rather than the user count. What it finds, how to run one, and how to read the curve it produces.
Running k6 at Scale: k6 OSS vs Grafana Cloud k6 vs LoadFocus
Three ways to run k6 at scale: self-hosted k6 with the k6 Operator, Grafana Cloud k6, or a managed platform, with the cost and effort of each.
News Analysis 2026: How AI Is Transforming Automated Load Testing for Peak Performance
AI in automated load testing today: drafting scripts, summarising results and where it falls short, plus how to run automated load tests in CI with gates.
How to Optimize Load Testing for Single Page Applications: A Practical Guide for 2026
An SPA does its work after the initial HTML, so HTTP-level tests miss most of it. Test the API calls the app makes, weighted the way the app makes them.
What are Virtual Users (VUs) in Load Testing? Definition + Examples
A virtual user simulates one person's session, pauses included. How VUs differ from requests per second, and why think time decides the ratio.
How to Create Realistic Load Testing Scenarios for E-Commerce Websites in 2026
Realistic e-commerce load testing: build the browse, search, cart and checkout mix from your funnel, give each shopper unique data and keep payments safe.
Rest Assured API Testing: Guide for Business Owners & DevOps
REST Assured is a Java library for functional API tests. Set up 6.2.0 with JUnit 5, run it against a public API, and see why it is no load tool.
Online API Tester: What It Is and Where It Stops
An online API tester sends HTTP requests from a browser. See what it does well, where CORS, private networks and secrets limit it, and when to use curl or k6.
What is Concurrency Testing in Software Testing?
Concurrency testing finds races, deadlocks and lost updates when operations overlap. Runnable Python demos with fixes, and how it differs from load testing.
Calculate concurrent users for load tests
Concurrent, simultaneous and active users are three different numbers, and mixing them invalidates the test.
What is the Hardest Part of Load/Performance Testing?
The hard part is realism: matching real user behaviour, data and think time.
Performance Testing Types: Key Benefits & Examples
Soak testing finds leaks that a short run cannot, and spike testing finds recovery behaviour. Pick the type from the risk you are trying to retire.
The Ultimate Guide to Enterprise Software Testing
Enterprise testing is dominated by integration and data, not by writing more unit tests.
From Slow to Superfast: How to Improve Your Website Speed in 10 Easy Steps
The biggest wins are usually images, requests and caching, in that order.
Quickly Establish a Performance Baseline: A Simple Guide for Immediate Results
A baseline turns future runs into comparisons instead of isolated numbers. Capture it on a stable build under representative load, then leave it alone.
Unlock the Secret to Effortlessly Overcoming Load Testing Obstacles!
The recurring obstacles are environment parity, test data and interpreting results. Most of them are planning problems rather than tooling problems.
Top 10 Lessons Learned in Load Testing This Year
Most lessons are about realism: data, think time and environment parity. A result nobody acts on is the same as not testing.
How Frontend Performance Testing Can Catapult Your Business to the Top
Backend metrics can look healthy while the page users see is still slow. Measure on a real device profile. Desktop numbers flatter almost every site.
How to Measure the Right Key Metrics During Performance Testing
The performance testing metrics worth tracking: response time percentiles, throughput, error rate, concurrency, and CPU, memory, disk, network and DB load.
Some websites are just too slow…
Users judge speed in the first couple of seconds, and most sites lose them there. Measure before assuming; the obvious culprit is often not the cause.
Why are Percentiles More Useful than Averages in Performance Testing
The 90th percentile is the value 90% of measurements stay at or under. How to calculate p90, p95 and p99, with a worked example, and why they beat the average.
Understanding Standard Deviation in Performance Testing
Standard deviation in performance testing: how far response times spread around the mean, how to calculate it, what counts as high and why to pair it with p95.
What is Disaster Recovery Testing in Software Testing?
A recovery plan that has never been executed is an assumption, not a plan. Test the restore, not just the backup; backups fail silently at restore time.
What is Stress Testing in Software Testing?
Stress testing pushes past expected load to find the breaking point and the failure mode. How the system recovers matters as much as where it broke.
Is My Email Campaign going to Bring my Website Down?
A campaign delivers its traffic in minutes, which is a spike rather than a load curve.
Understanding 500 Internal Server Errors in GET or POST Requests
Why a GET or POST request returns 500 Internal Server Error: a body the server cannot parse, missing headers or cookies, exhausted pools, and how to debug it.
Enable gzip compression on NGINX
gzip on NGINX is a few lines of config and usually the cheapest bandwidth win available.
Top 10 Performance Testing Tips and Tricks
Decide what you are measuring and why before configuring anything. Choose the metrics up front, or you will report whatever looks best afterwards.
UI and performance testing for UI heavy web applications – solutions
Combine a large HTTP load with a small number of real browser sessions. Watch client-side metrics, since the server can be fast while the page is not.
What is Throughput in Performance Testing? Definition + How to Measure
Throughput is work completed per unit of time: requests per second = completed requests / test seconds. Units, formula and how to measure it in JMeter and k6.
What is Response Time in Performance Testing?
Response time testing explained: what response time is, how to measure it, why p95 beats the average, and what a good response time is.
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The Load Testing Platform with AI That Explains Your Results
Load test websites and APIs from 25 cloud regions, monitor page speed and uptime, and get AI analysis that explains your results in plain English.