forbes-0023
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The interactive drag section described the original naive implementation (re-solve from scratch each step) and called the caching layer a 'planned future optimization'. In reality _DragCache is fully implemented: pre_drag() builds the system, Jacobian, and compiled evaluator once, and drag_step() reuses them. Update code snippets, add _DragCache field table, and document the single_equation_pass exclusion from the drag path.