关于Java中重度数学计算的问题

I am using Java in my project which does a lot of mathematical calculations. In the next iteration of the project, some more calculations will be added. From my knowledge of Java, I suspect that this will cause performance issues. Is it a wise decision to delegate the heavy calculations to a low level language like Fortran or C? I can fire native calls to communicate with the low level languages. Java will take the control once the calculations are performed by Fortran or C. Will this better the performance?I am using Java in my project which does a lot