Performance, Core Web Vitals & Mobile SEO: Experiment design
Treat uncertain changes as experiments with a hypothesis, a control, and a decision rule. Part of the Performance, Core Web Vitals & Mobile SEO module in a complete path from SEO fundamentals to professional delivery.
Why this lesson — Experiment design
Treat uncertain changes as experiments with a hypothesis, a control, and a decision rule. Inside the "Performance, Core Web Vitals & Mobile SEO" module: Connect technical performance to conversion and prioritize the largest bottlenecks over cosmetic optimizations.
- Level: Intermediate
- Lesson 18 of 25 inside this module
- Start from the problem before choosing a tactic
How to do it, step by step
Run these steps in order on a real project, and do not jump ahead before the previous step is done.
- Write: if we change X, then Y will move because Z
- Choose control pages that match in traffic and intent
- Set the runtime and the decision rule up front
Quality bar before you call this done
If one of these is missing, the work is not ready to ship or to hand over.
- No mid-test changes
- Result is documented even when negative
- Learning is reusable
Practical assignment
Identify three LCP, INP, or CLS opportunities and explain the impact of each. Apply it specifically through this lesson's lens: Experiment design.
- Keep the output to one page
- State what you will measure and when
- Define the next step and its owner
Turn the idea into a clear output.
Identify three LCP, INP, or CLS opportunities and explain the impact of each.
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