Retail and commerce media networks sit on rich first-party data, but for too many of them, building the custom audience segments that brands want is slow, resource-intensive, and manual. When a brand asks for a granular and specific segment, the answer has too often been "no," or "not for weeks." In this breakout, JR Crosby of Gopuff and Somer Simpson of GrowthLoop walk through what happens when that constraint disappears: Gopuff expanded from roughly 100 audiences to over 600 after connecting its data cloud to a composable audience layer. Pulling hyper-customized segments now takes less than 48 hours, not weeks. The conversation focuses on what brands are asking for, why legacy RMN tech stacks can't deliver it, how to get there, and what it looks like when speed and scale are no longer trade-offs.