As others have said earlier, if the new tools serve the problem domain better there will be significant gain. My first game server was hand crafted with php/my

As others have said earlier, if the new tools serve the problem domain better there will be significant gain. My first game server was hand crafted with php/mysql. It did work and was able serve players, however moving to Erlang allowed two order of magnitude more players onto the same box, while the code maintainability increased as well.