I'd say that's always the case. Performance for the vast majority of code is good enough with idiomatic or even horrible code. Places where you need to work aga

I'd say that's always the case. Performance for the vast majority of code is good enough with idiomatic or even horrible code. Places where you need to work against the language for perf reasons should be rare (and if it concerns most of the code in a project, then I'd question the choice of language for that project). Also that holds true for most languages. Even in C you'll avoid allocations in tight loops that need to be fast because it comes with an unpredictable performance cost. That's not much different than pre-allocating a buffer to work on prior to an algorithm in C#.