Hey, I'm Oleh — a Performance QA Engineer who has been breaking systems professionally for a while now. In a good way, of course. I also teach performance testing — you can check out my hands-on course below: 🎯 Performance Testing: From Basics to Hands-On We're starting a series: Common Mistakes in Performance Testing that I usually see. Each part covers one mistake in depth. Today — the one that surprises people the most when they first hear it. The Problem You built a great script. Results look terrible. Before blaming the app — where did you run the test from? Before you start blaming the app — where exactly did you run that test from? One of the most common mistakes I see is engineers running load tests from their local machine while the application is hosted somewhere completely different. Say, you're sitting in Europe, your app is deployed in the US, and you're wondering why response times look so bad. Here's the thing — your test is not just measuring how the app performs.…