Psyco is a JIT compiler for the programming language Python. While he hardly brings advantages in I / O -heavy programs, it may, by 4 the execution of programs that claim very much especially the CPU - speed up to 100 times.

Currently Psyco for Intel-based processors (x86 ) for Windows, Mac OS X, Linux and BSD derivatives are available, the functionality is complete. Since 2007, the project is no longer being developed, since 2012 it is no longer maintained. A follow-up project with significant scale is PyPy, the developers recommend using it now.