yes, but that's not a JVM-like slowdown. It's fairly well amortised and _clearly_ not a matter of consideration when writing an app or a library. If your issue

yes, but that's not a JVM-like slowdown. It's fairly well amortised and _clearly_ not a matter of consideration when writing an app or a library. If your issue is "atomics are slowing down my app", then I assume you already milked the code to the latest micro second of performances everywhere else. This is likely not the case here and not a general advice I would give to anyone. Remember, some dev in python where concurrency is inexistent, start-up time is horrendous and performances are abysmal compared to rust. (this is exaggerated: of course you can run stuff in parallel in python)