In higher level languages your code may allocate memory or trigger a GC pass or other smartness in unexpected places. This may cause slowdowns you may not have

In higher level languages your code may allocate memory or trigger a GC pass or other smartness in unexpected places. This may cause slowdowns you may not have control over or may change from version to version or vendor to vendor. It is often easier to manage in "faster" languages. Good algorithm may not be enough.