What Throttling is: The act of limiting the amount of traffic available for testing. This is useful on high-traffic sites or pages—like a homepage.
What Throttling is not: Testing all traffic, which is a method typically employed on low-traffic sites and pages. If traffic is low, throttling could extend the time it will take to achieve confidence beyond reason.
Why Throttling matters: Some tests might be too risky—in terms of impact on key conversion points or the homepage—to extend to all users or too expensive due to excessive Mbox calls. In these cases, throttling traffic to reduce liabilities is desirable.
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