I was astonished that "carbon-Mac squeak is slow with ftp primitives" 
and I have been told that probably results from old Mac API 
(Opentransport probably) but...  I am now extremely surprised that the 
ftpSocket speed could be accelerated  by using
[ ftpSocket primitives ] forkAt: Processor highIOPriority.
The difference between  processes with highIOPriority and nothing is 
about  four times ?
I don't understand how a primitive is more or less rapid. Something 
gives a priority in a primitive ?

Jean-Marie Zajac