You’re misunderstanding the discussion. If you think of queuing as “waiting to process” then yes it’s slower than not waiting. But that’s not at all the necess

You’re misunderstanding the discussion. If you think of queuing as “waiting to process” then yes it’s slower than not waiting. But that’s not at all the necessary implication of these components. In fact “synchronous” requests are buffered (queued?) internally and can be delayed before processing. So the distinction is irrelevant to performance. And the implementation is what matters.