It depends on the application. You have to balance the costs of writing efficient code with the costs of running the machines. If you have lots of users hittin

It depends on the application. You have to balance the costs of writing efficient code with the costs of running the machines. If you have lots of users hitting your servers, it's worth investing more in efficiency, but if you barely have any, it's much more worth it to write in a convention focusing on maintainability.