Can anyone quantify performance differences between C++ and Java?

Question

Java was initially slow before the JIT but today performance is pretty close to C++. I want to know if someone has done measurable performance comparisons between the two langu

Answer 1

Java apps have an initialization overhead that C++ programs do not. When JITed, they are not micro-optimized as much as C++ programs. Also, there is a small runtime overhead (GC + indirect call overhead). Overall, these quantifiable differences don't add up to much. But...

It's well known that when a Java app first starts, it must activate its flux capacitor to bring it's environment back to 1995. This introduces a little delay in startup. But once that's over, the JVM performs about as well as a comparable C++ program running on hardware from 1995.