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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Is nobody else noticing async abuse everywhere? Async IO is a separate issue from what I was talking about, but it's also something that gets abused like crazy. 3-5x code bloat "because threads are bad" - umm... kernels have significantly improved since the c10k days... No...
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I am not sure, sorry :/
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