Rather than comparing languages in absolute, I think it's worthwhile to consider energy (or computational) efficiency achieved in given amounts of developer working time. Here Nim already has a advantage in terms of productivity.
Add to that compile-time execution, templates and macros and it becomes much easier to optimize applications quickly. As a side note, I found it useful to think that code is not "faster" or "slower". The CPU always runs at the same speed. You save time and energy by taking the shortest route to your destination.
