A system includes one or more memory devices storing instructions, and one or more processors configured to execute the instructions to perform steps of a method for generating a data tree structure for expediting rule-based decision-making. The system may receive a rules file having a plurality of rules, where each rule has one or more conditions and one or more actions. The system may generate a plurality of condition frequency counts that represent the total number of rules having a condition of a particular unique condition type. The system may then generate a tree structure based on the plurality of rules and the plurality of condition frequency counts, where the tree structure includes a root node and one or more node branches, where each node branch includes a first-level node and zero or more second-level nodes that each include a node condition and zero or more node actions.