tools Updated 29 August 2026
Capturing HTTP Traffic That Isn't in a Browser Tab
DevTools cannot see a mobile app, a desktop client or a service calling an API. Fiddler, mitmproxy and JMeter's recorder can.
Read more 75 articles
Thoughts & insights
Articles about performance testing, tools, methods, and lessons learned from years of enterprise experience.
tutorials Updated 29 August 2026
Correlation in JMeter: Finding and Extracting Dynamic Values
How to correlate dynamic values in JMeter: find what actually needs extracting, capture it with the Boundary, Regex or JSON extractor, and prove it worked.
Read more tutorials Updated 29 August 2026
JTL Files in JMeter: What They Are and How to Open One
A .jtl file is JMeter's test log. What JTL stands for, what each column holds, how to open one, and how to repair a file that breaks the HTML report.
Read more tutorials Updated 29 August 2026
Write Full JMeter Response Data to a File with JSR223
Use a JSR223 sampler and Groovy to write full HTTP response bodies, headers and status codes to a file in JMeter.
Read more tutorials Updated 28 August 2026
HAR to JMX File
Capture network traffic in Chrome as a HAR file and turn it into a JMeter JMX test plan — the conversion options, and why a raw conversion is never a working test.
Read more performance 27 August 2026
Four Ways Generated Test Data Stops Being Test Data
Generated data can load cleanly, match its schema and pass every row count while making your load test measure the wrong thing entirely. Here are the four failures that cause it, and how to check your own data in ten minutes.
Read more performance 12 August 2026
Three Things That Silently Break When You Migrate a Performance Test
Migrated scripts can run clean, pass a linter and produce a healthy report while testing almost nothing. Here are the three failures that cause it, and how to check your own suite in ten minutes.
Read more tools 18 March 2026
Distributed Load Testing on Kubernetes: JMeter, k6, and Gatling — All Three, Done Right
Most distributed load testing solutions on Kubernetes support one tool. Here's why that's a problem, and how to run JMeter, k6, and Gatling distributed tests natively on K8s.
Read more tools 17 March 2026
Migrating Performance Test Scripts Between JMeter, k6, and Gatling
A practical look at the challenges of migrating load test scripts between frameworks, and how automated conversion can save weeks of manual effort.
Read more tools 27 February 2026
The Correlation Problem: A JMeter Story
A real-world account of chasing dynamic values through JMeter test scripts, and why manual correlation still catches out even experienced performance engineers.
Read more tools 10 February 2026
Introducing DummyDataGenPro: Synthetic Test Data Generation Platform
Generate realistic test data up to 10M+ rows with 50+ pre-built templates in JSONL, CSV, and Parquet formats - web-based platform with free tier.
Read more tutorials 5 February 2026
Editing JMX Files from the Command Line
Techniques for modifying Apache JMeter test plans from the terminal using sed, awk, and nano - and when these approaches fall short.
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