How do you optimize CI/CD pipeline performance?
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Quick Answer
Parallelize independent stages, cache dependencies and build layers, run only affected tests (test selection), use faster/ephemeral runners, and fail fast so broken builds stop early.
Detailed Answer
Slow pipelines throttle delivery, so treat pipeline time as a first-class metric. Techniques: dependency and Docker layer caching, build matrices/parallel jobs, incremental or affected-only testing, artifact reuse across stages, and right-sized runners. Also split monolithic pipelines and cache at the right granularity to avoid cache invalidation churn.
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Interview Tip
Mention caching + parallelism + affected-only tests, and treating pipeline duration as a tracked metric.
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