For me the issue is less performance and more correctness/completeness. Mathworks has teams of engineers working on their toolboxes, which helps a lot for users

For me the issue is less performance and more correctness/completeness. Mathworks has teams of engineers working on their toolboxes, which helps a lot for users that need features and needs them to work correctly. It's been some time since I had to use Octave because I didn't want to pay for a Matlab license, but I recall remez() didn't properly implement the Parks-McClellan algorithm and would return suboptimal results (which is a problem, when the algorithm is intended to find the optimal solution). Also, Simulink.