If you can write your models in AMPL or GAMS or some modeling language, you would be able to test IPOPT's raw speed. I used IPOPT from AMPL for years and it is

If you can write your models in AMPL or GAMS or some modeling language, you would be able to test IPOPT's raw speed. I used IPOPT from AMPL for years and it is a formidable solver for general large-sparse NLPs. It would be nice to see benchmarks against it.