Fetching a connection from a (sane) pool isn't just a memory lookup. Database conenctions have to be cleared of state (transactions, temp tables, prepared state

Fetching a connection from a (sane) pool isn't just a memory lookup. Database conenctions have to be cleared of state (transactions, temp tables, prepared statement handles, ...) which takes time as well. Otherwise one runs into "funny" bugs at some point in time.