<s>
Psyco	B-Language
is	O
an	O
unmaintained	O
specializing	B-Algorithm
just-in-time	O
compiler	O
for	O
pre-2.7	O
Python	B-Language
originally	O
developed	O
by	O
Armin	O
Rigo	O
and	O
further	O
maintained	O
and	O
developed	O
by	O
Christian	O
Tismer	O
.	O
</s>
<s>
Psyco	B-Language
ran	O
on	O
BSD-derived	O
operating	O
systems	O
,	O
Linux	B-Application
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
and	O
Microsoft	B-Application
Windows	I-Application
using	O
32-bit	O
Intel-compatible	B-Operating_System
processors	O
.	O
</s>
<s>
Psyco	B-Language
was	O
written	O
in	O
C	B-Language
and	O
generated	O
only	O
32-bit	O
x86-based	O
code	O
.	O
</s>
<s>
Although	O
Tismer	O
announced	O
on	O
17	O
July	O
2009	O
that	O
work	O
was	O
being	O
done	O
on	O
a	O
second	O
version	O
of	O
Psyco	B-Language
,	O
a	O
further	O
announcement	O
declared	O
the	O
project	O
"	O
unmaintained	O
and	O
dead	O
"	O
on	O
12	O
March	O
2012	O
and	O
pointed	O
visitors	O
to	O
PyPy	B-Language
instead	O
.	O
</s>
<s>
Unlike	O
Psyco	B-Language
,	O
PyPy	B-Language
incorporates	O
an	O
interpreter	O
and	O
a	O
compiler	O
that	O
can	O
generate	O
C	B-Language
,	O
improving	O
its	O
cross-platform	B-Operating_System
compatibility	O
over	O
Psyco	B-Language
.	O
</s>
<s>
Psyco	B-Language
can	O
noticeably	O
speed	O
up	O
CPU-bound	O
applications	O
.	O
</s>
<s>
The	O
average	O
speed	O
improvement	O
is	O
typically	O
in	O
the	O
1.5-4x	O
range	O
,	O
making	O
Python	B-Language
performance	O
close	O
to	O
languages	O
such	O
as	O
Smalltalk	B-Application
and	O
Scheme	B-Language
,	O
but	O
still	O
slower	O
than	O
compiled	O
languages	O
such	O
as	O
Fortran	B-Application
,	O
C	B-Language
or	O
some	O
other	O
JIT	O
languages	O
like	O
C#	B-Application
and	O
Java	B-Language
.	O
</s>
<s>
Psyco	B-Language
also	O
advertises	O
its	O
ease	O
of	O
use	O
:	O
the	O
simplest	O
Psyco	B-Language
optimization	O
involves	O
adding	O
only	O
two	O
lines	O
to	O
the	O
top	O
of	O
a	O
script	O
:	O
</s>
<s>
These	O
commands	O
will	O
import	O
the	O
psyco	B-Language
module	O
,	O
and	O
have	O
Psyco	B-Language
optimize	O
the	O
entire	O
script	O
.	O
</s>
<s>
This	O
approach	O
is	O
best	O
suited	O
to	O
shorter	O
scripts	O
,	O
but	O
demonstrates	O
the	O
minimal	O
amount	O
of	O
work	O
needed	O
to	O
begin	O
applying	O
Psyco	B-Language
optimizations	O
to	O
an	O
existing	O
program	O
.	O
</s>
