My SciPy ODE Solver Was Killing My Bayesian Inference: A Cosmologist’s Honest Account of Discovering Diffrax

# A Scientist's Discovery: Switching Tools Sped Up His Research by Orders of Magnitude A cosmologist realized his old data analysis software was creating bottlenecks in his work, slowing down his ability to test scientific theories—so he switched to a newer tool and saw dramatic improvements. The story illustrates a common problem professionals face: sticking with familiar tools even when better options exist, and reveals the practical mistakes he made along the way that others can learn from.