Original sentence: It works by first profiling the application to see which parameters are "common" to which functions, then JIT compiles those functions, with those parameters [to machine code, kind of like compiling it to C, with those parameters].Psyco works by using a "type specialized" compiler, i.So it basically is a JIT "parameter friendly" optimizer.The following paragraph gives a very rough, but mostly wrong, introduction to Psyco:.based on the different parameters you pass into a function, it will compile several versions of that function, to match the parameters