Why Java is better than C++ for high speed trading systems (news.efinancialcareers.com)

Like the author, I've seen Java systems be much faster than (poorly written) c++ systems.

However, I've also seen systems written in Ruby that were much faster than (poorly written) Java systems, and also c++ systems that were properly written that Java was not able to touch either in terms of performance, scale, or reliability.

If your available talent is Java app developers, trying to write something in c++ is not likely to end well.

Rust or C/C++ are going to always be slightly faster but is it often worth it? rarely.