Large-scale rapid movement of funds (RMoF) plays a central role in certain types of financial crime, like VAT fraud. Accurate and fast identification of RMoF patterns in transaction data is essential to detect agents engaging in these crimes. In this talk, we will walk you through our journey to find an approach that balances flexibility, accuracy and speed. We will discuss the insights we gained along the way, and how others fighting financial crime can use them to maximize their impact. Of course, we will share some details of the solution we finally settled on, too.