I have to second this. I tried to write a 3d modelling tool in Java. I got decent, but not stellar performance only once I consciously started to fight the GC i

I have to second this. I tried to write a 3d modelling tool in Java. I got decent, but not stellar performance only once I consciously started to fight the GC in my code. I converted that code to C++ and recently added a custom allocator to improve performance even further. The result is now functionally equivalent, but about 5 times faster.