OK, I ran the Python benchmark suite.  I don't have much experience with the benchmark suite so let me know if I did something wrong or need to do more.  I ran the following:

python perf.py -b 2n3 ../cpython/python.exe ../cpython/python-with-sorting.exe)

which produces:

Report on Darwin quicksilver 11.4.0 Darwin Kernel Version 11.4.0: Mon Apr  9 19:32:15 PDT 2012; root:xnu-1699.26.8~1/RELEASE_X86_64 x86_64 i386
Total CPU cores: 4

### call_method_slots ###
Min: 1.925941 -> 1.883251: 1.02x faster
Avg: 1.931082 -> 1.887380: 1.02x faster
Significant (t=39.92)
Stddev: 0.01233 -> 0.00526: 2.3439x smaller
Timeline: http://tinyurl.com/8943trh

### call_simple ###
Min: 1.447890 -> 1.367729: 1.06x faster
Avg: 1.451100 -> 1.371689: 1.06x faster
Significant (t=118.46)
Stddev: 0.00497 -> 0.00654: 1.3168x larger
Timeline: http://tinyurl.com/7j7uppg

### fastpickle ###
Min: 3.313799 -> 3.240090: 1.02x faster
Avg: 3.328812 -> 3.248734: 1.02x faster
Significant (t=44.45)
Stddev: 0.00918 -> 0.00883: 1.0404x smaller
Timeline: http://tinyurl.com/6tsk347

### iterative_count ###
Min: 1.277516 -> 1.240536: 1.03x faster
Avg: 1.280186 -> 1.242743: 1.03x faster
Significant (t=38.46)
Stddev: 0.00534 -> 0.00435: 1.2288x smaller
Timeline: http://tinyurl.com/d7vzqjf

### json_load ###
Min: 2.944439 -> 2.877168: 1.02x faster
Avg: 2.950717 -> 2.889950: 1.02x faster
Significant (t=23.96)
Stddev: 0.00737 -> 0.01635: 2.2179x larger
Timeline: http://tinyurl.com/6onbxzf

### regex_compile ###
Min: 2.354580 -> 2.417407: 1.03x slower
Avg: 2.361253 -> 2.421576: 1.03x slower
Significant (t=-44.01)
Stddev: 0.00780 -> 0.00575: 1.3555x smaller
Timeline: http://tinyurl.com/6wryn9v

### richards ###
Min: 0.905023 -> 0.883842: 1.02x faster
Avg: 0.908634 -> 0.888653: 1.02x faster
Significant (t=18.96)
Stddev: 0.00479 -> 0.00571: 1.1911x larger
Timeline: http://tinyurl.com/chgz4ge

### silent_logging ###
Min: 0.432982 -> 0.462848: 1.07x slower
Avg: 0.434553 -> 0.465406: 1.07x slower
Significant (t=-32.15)
Stddev: 0.00390 -> 0.00556: 1.4256x larger
Timeline: http://tinyurl.com/d3penzy

The following not significant results are hidden, use -v to show them:
call_method, call_method_unknown, fastunpickle, float, formatted_logging, json_dump, nbody, normal_startup, nqueens, pidigits, regex_effbot, regex_v8, simple_logging, startup_nosite, threaded_count, unpack_sequence.