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Now, that said, this problem was much worse in the past (see this issue), where using join_all would lead to a quadratic number of calls to poll. Today, it is only a constant factor slower than the for loop, but the constant is rather large. It uses FuturesUnordered internally, which has a rather large amount of overhead because it stores all of the futures in a linked list, using a separate allocation for each JoinHandle.
Done.
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