<b>Scaling budget 50%/day costs a 19% CPA tax; 20%/day costs 4%</b>

<b>Scaling budget 50%/day costs a 19% CPA tax; 20%/day costs 4%</b>
Across 25 winning campaigns scaled deliberately, 90d.
— +20%/day: CPA ▲4%, delivery stable
— +35%/day: ▲11%
— +50%/day: ▲19% and frequent re-learning
— Duplicate-and-double: ▲ worst, fragments the pixel signal
Fast budget jumps push Meta back into exploration and into pricier auction tiers before the cheap inventory is exhausted.
Read: scale a winner 20%/day. The patience costs you a few days; the 50% sprint costs you a fifth of your margin.