Lots of single-pass compilers can achieve 1MLOC/s. But the main problem is that C++ has an O(n^2) compilation model due to header explosion. Also, expanding C++

Lots of single-pass compilers can achieve 1MLOC/s. But the main problem is that C++ has an O(n^2) compilation model due to header explosion. Also, expanding C++ templates is very computationally intensive.