<b>CUPED can cut the traffic you need by 30-50% with zero UX change.</b>

<b>CUPED can cut the traffic you need by 30-50% with zero UX change.</b>
It's a variance-reduction trick: use each user's pre-experiment behavior as a covariate to strip out predictable noise from the conversion metric.
— Works best when pre-period behavior strongly predicts the outcome (repeat buyers, logged-in users).
— Near-useless for first-touch anonymous traffic with no history.
Same test, narrower confidence interval, faster decision.
Read the number, not the story. [variance −40% typical · logged-in cohort]