The goal of CI/CD is not speed for its own sake — it is confidence. A pipeline your team trusts is one they use for every change. A pipeline they do not trust is one they bypass "just this once," which is where outages come from.
Make it fast
Slow pipelines get skipped. Caching dependencies, running independent steps in parallel, and only testing what changed keep feedback in the minutes-not-hours range, which is what keeps people using it.
Make it reproducible
Every environment should be defined in code and built the same way every time. When staging and production are described by the same Infrastructure as Code, "it worked on staging" actually means something.
Make failure safe
Quality gates stop bad changes early, and one-command rollback means a mistake is a minor event, not a crisis. When recovery is cheap, teams ship more — and paradoxically, more often safely.