The OP was talking about program startup time and measuring that by comparing hello world programs. When I run the above hello world program compiled with gjc

The OP was talking about program startup time and measuring that by comparing hello world programs. When I run the above hello world program compiled with gjc is 25% slower that the C program. Compare that with the OP's measured version being 300 times slower than the C version when compiled with Oracle's JDK. Eclipse is not representative of a typical command line program. Write "ls" with the OpenJDK and tell me you don't pull you hair out waiting for it to start up when using it.