I think the reason to use C/C++ over java has less to do with the various optimizations and more to do with control over memory layout (and thus at least indire

I think the reason to use C/C++ over java has less to do with the various optimizations and more to do with control over memory layout (and thus at least indirect control over cache usage and so on). Plus you remove a lot of "noise" in terms of performance (GC hiccups, JIT translation, VM load time, etc.).