The article “Progress in mathematical programming solvers from 2001 to 2020” by Thorsten Koch, Timo Berthold, Jaap Pedersen and Charlie Vanaret is the most cited paper in the EURO Journal on Computational Optimization since 2022. The article contains a comprehensive performance comparison of the virtual best LP/MILP solver from 2001 with the best solvers from 2020. It presents a deep dive into how LP and MILP solvers can be measured, how to evaluate without bias, and how to interpret the results.