Investigate a performance regression
Isolate what made a service, page, or workflow slower.
What this prompt helps you do
A measurement plan, ranked causes, and low-risk optimisation path.
When to use it
Performance has degraded and guesses are replacing evidence.
What to prepare
The goal, relevant source material, constraints, examples, and the decision or action this should support.
How to get a strong result
Add the facts, constraints, source material, and desired format that the model cannot know.
How to use this prompt
Replace each placeholder with accurate context. Paste the complete prompt into Codex, review the response critically, resolve important questions, and use it as a considered input to the next decision—not as an unchecked final answer.