Compared to the OP, your post is just random, non-funny sarcasm. The OP has highlighted relevant data points.
1. Writing a system the second time is easier since you already know the pitfalls and avoid them.
2. Ruby, Python, Perl, Java... provide thin wrappers for the underlying IO system calls, and hence, Java IO isn't very different from Ruby IO when it comes to performance.
3. There are only a few CPU intensive tasks. It goes without saying that Java will kick Ruby's(pure Ruby; native extensions will be a different story)ass when it comes to CPU intensive tasks.
1. Writing a system the second time is easier since you already know the pitfalls and avoid them.
2. Ruby, Python, Perl, Java... provide thin wrappers for the underlying IO system calls, and hence, Java IO isn't very different from Ruby IO when it comes to performance.
3. There are only a few CPU intensive tasks. It goes without saying that Java will kick Ruby's(pure Ruby; native extensions will be a different story)ass when it comes to CPU intensive tasks.