I would be surprised if successful C++ to Java rewrites yielding better speed were rare as we move to multicore and correcness & safety are the bottleneck prob

I would be surprised if successful C++ to Java rewrites yielding better speed were rare as we move to multicore and correcness & safety are the bottleneck problems there. But I'm not a Java programmer or follw the scene closely. Also the narrower niche of C++ means that it often makes sense to rewrite a small part of a Java app in C++, but it rarely makes sense to write a small part of a C++ app in Java. This domain difference can also explain the relative frequency of public "made it faster with C++" posts, since those small self contained uses make good posts that aren't entangled with the bigger application.