Even on the same machine using sockets is going to be much slower than function calls, or shared memory access. One of the criticisms of early X Windows system

Even on the same machine using sockets is going to be much slower than function calls, or shared memory access. One of the criticisms of early X Windows system was its slow performance on local machines. But the client-server design of X-Windows was quite deliberate. Makes me wonder if this CAD system had a similar pedigree? I think we’re only hearing half the story here.