Futures are a cheap knock-off of lazy evaluation, and they have the same problems when reasoning about runtime performance.
Yet, people in the #rustlang community have this fixation on async code "because performance" 
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A super biased measurement (but it's not like anybody measures these days before cutting themselves on implementation complexity anyway...) https://gist.github.com/spacejam/c70fa85479cc224e574e4cf3c06a280b …
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Rust’s position isn’t that threads are bad! They’re included with the language for good reason. The book even builds a web server with threads.
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