[absherwin]

C/C++ shouldn't generally be needed. The computationally intensive part is optimized. What makes a given system slow is either poorly optimized numerical code (less common) or doing a bunch of needless repetitive work because the system doesn't make it easy to separate different components of the modeling.

They also won't even be seriously considered at most large companies because the typical person in that role doesn't have the skills and a single-person using a different solution makes it difficult to transition work.