Hello Larry, thank's for showing my French ears a new word (malapert). A polite way to avoid saying something else... Regarding my post, the informations that are get thru AIS (info transmitted thru VHF and then transformed to 6bit encapsulated data are stored in my software in UDTs like so: Public Type TargetData ChronoSec As Long Delai As Long MMSI As String NavStatus

Of course I know that the list version is very unfair, but I wanted to see what was the trade off between elegance and speed. Regarding whether low level programming makes sense or not, I was just curious to see what are the limits of Haskell. Moreover there is not much literature on high performance Haskell programming (tricks like unsafeWrite), at least organized in a systematic and concise