Not really, Carmack explicitly states that this is not a performance optimisation in the article: > In no way, shape, or form am I making a case that avoiding

Not really, Carmack explicitly states that this is not a performance optimisation in the article: > In no way, shape, or form am I making a case that avoiding function calls alone directly helps performance. Rather, he argues that (among other things) this is a way to make current bugs more visible and to avoid future bugs by disallowing calling functions that should be inlined.