You can use `Futures::StreamExt::buffer_unordered` for this. [1] is an example where I used it for benchmark which creates a certain amount of QUIC connections

You can use `Futures::StreamExt::buffer_unordered` for this. [1] is an example where I used it for benchmark which creates a certain amount of QUIC connections at a time. But you can also spawn all tasks upfront via `tokio::spawn`, and let them wait on a `tokio::sync::Semaphore` before making the request. The drawback of this is that you might allocate more memory for tasks upfront - but if you don't have an extremely high number it might not matter. [1] https://github.com/quinn-rs/quinn/blob/de627437bc7d836564c3666c8d2885110b74833d/bench/src/bulk.rs#L105-L124 https://github.com/quinn-rs/quinn/blob/de627437bc7d836564c36...