String conversion. If I use byte array to string conversion I move from 0.35ms to 1774.73ms. And if I do what the test needs to do (get the length of the string “s.utf8.count”), I am at 2737.4ms. Which is an additional second spend doing factually nothing. IMHO this is very worrying for Swift on the Server as WebServers are nothing but string jugglers. In order to be able to do this juggling efficiently, we need a lighter string.