CourseRunning Tests - A/B TestingWhen to Stop Testing and Scale
    intermediate
    4 min read

    When to Stop Testing and Scale

    Knowing when to shift from optimization to execution

    You don't need perfection to scale. Once you have:

    • CPA below LTV
    • ROAS consistent with your LTV and payback assumptions
    • Incrementality materially above organic baseline
    • Stable performance for 2+ weeks

    Stop testing and start scaling. You can continue optimizing, but don't let perfect be the enemy of good.

    • • •
    Common Trap

    Many advertisers over-test and under-scale. They have working campaigns but keep tweaking instead of scaling what works.

    • • •
    Balance
    • 70% of effort: Scaling proven campaigns
    • 20% of effort: Optimizing existing campaigns
    • 10% of effort: Testing new approaches

    Testing is important, but execution and scale matter more once you've found product-market fit with your campaigns.

    • • •
    Next Chapter Preview

    Up to now, we've focused on how advertisers think about performance — targeting, attribution, testing, and scaling. Next, we flip the perspective. We'll look at the publisher side of the market: how inventory is created, how incentives shape quality, and why understanding supply dynamics is critical to choosing the right channels and avoiding hidden inefficiencies in performance-driven campaigns.

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