No... E.g.: On the same thread: 1. fiber A receives request and queries DB (async) 2. fiber B computes for 1 second 3. fiber A sends response.Latency: 1 second even if all the other threads are free.
This is a problem of having blocking 1 second computation in same fiber pool as request handlers -> broken application design. Hiding that issue by moving fibers between threads is just making things worse.