{{{
#!python
class PsycoMiddleware(object):
    """
    This middleware enables the psyco extension module which can massively
    speed up the execution of any Python code.
    """
    def process_request(self, request):
        try:
            import psyco
            psyco.profile()
        except ImportError:
            pass
        return None
}}}

Note that you can use `psyco.full()` instead of `psyco.profile()`. See http://psyco.sourceforge.net/psycoguide/node8.html

'''Note that Psyco should only be used on 32bit systems'''. See http://www.alrond.com/en/2007/jan/25/performance-test-of-6-leading-frameworks .

One possible way to determine the architecture automatically:
{{{
#!python
from platform import architecture

if architecture()[0] != '32bit':
    raise Exception("Don't use this on non-32-bit platforms")

class PsycoMiddleware(object):
    """
    This middleware enables the psyco extension module which can massively
    speed up the execution of any Python code.
    """
    def process_request(self, request):
        try:
            import psyco
            psyco.profile()
        except ImportError:
            pass
        return None
}}}

----

One more issue I have with this -- why is import done on every request as opposed to module load time? The following looks saner to me:
{{{
#!python
from platform import architecture

if architecture()[0] != '32bit':
    raise Exception("Don't use this on non-32-bit platforms")

# let ImportError propagate at module load time so that people can notice and fix it
import psyco

class PsycoMiddleware(object):
    """
    This middleware enables the psyco extension module which can massively
    speed up the execution of any Python code.
    """
    def process_request(self, request):
        psyco.profile()
        return None
}}}

Or even (that's how I use it, and according to `psyco.log()` it seems to work)
{{{
#!python

import psyco
# psyco.log() -- uncomment this if you want to see how psyco performs
psyco.cannotcompile(re.compile)
psyco.profile()

class PsycoMiddleware(object):
    pass
}}}
See http://psyco.sourceforge.net/psycoguide/tutknownbugs.html#tutknownbugs for `cannotcompile()`.

Note about memory consumption:
You can limit the memory that psyco takes to compile code. This can be help full on limited memory systems in conjunction with mod_python apache prefork.
{{{
#!python

psyco.profile(memory=2048) # roughly limit memory consumption to 2048Kb
}}}

See http://psyco.sourceforge.net/psycoguide/node14.html for more information