<objective Measure, assert, and protect application performance with budgets enforced in CI, not subjective "feels fast enough" assessments. This skill covers two domains: load testing (can the backend handle traffic?) and web performance (is the frontend fast for users?). A report that says "LCP is 3.2s" is information; a CI gate that fails the build at 2.5s is accountability. </objective Quick Route | You need to... | Go to | |----------------|-------| | Test backend capacity / throughput / latency under traffic | k6 Load Testing → | | Pick a load shape (constant / ramp / spike / soak) | Lo…