I ran the whole benchmark suite. There are a few that are slower: call_method_slots, float, pickle_dict, and unpack_sequence.

Report on Linux zach-vbox 3.2.0-24-generic-pae #39-Ubuntu SMP Mon May 21 18:54:21 UTC 2012 i686 i686
Total CPU cores: 1

### 2to3 ###
24.789549 -> 24.809551: 1.00x slower

### call_method_slots ###
Min: 1.743554 -> 1.780807: 1.02x slower
Avg: 1.751735 -> 1.792814: 1.02x slower
Significant (t=-26.32)
Stddev: 0.00576 -> 0.01823: 3.1660x larger

### call_method_unknown ###
Min: 1.828094 -> 1.739625: 1.05x faster
Avg: 1.852225 -> 1.806721: 1.03x faster
Significant (t=2.28)
Stddev: 0.01874 -> 0.24320: 12.9783x larger

### call_simple ###
Min: 1.353581 -> 1.263386: 1.07x faster
Avg: 1.397946 -> 1.302046: 1.07x faster
Significant (t=24.28)
Stddev: 0.03667 -> 0.03154: 1.1629x smaller

### chaos ###
Min: 1.199377 -> 1.115550: 1.08x faster
Avg: 1.230859 -> 1.146573: 1.07x faster
Significant (t=16.24)
Stddev: 0.02663 -> 0.02525: 1.0544x smaller

### django_v2 ###
Min: 2.682884 -> 2.633110: 1.02x faster
Avg: 2.747521 -> 2.690486: 1.02x faster
Significant (t=9.90)
Stddev: 0.02744 -> 0.03010: 1.0970x larger

### fastpickle ###
Min: 1.751475 -> 1.597340: 1.10x faster
Avg: 1.771805 -> 1.613533: 1.10x faster
Significant (t=64.81)
Stddev: 0.01177 -> 0.01263: 1.0727x larger

### float ###
Min: 1.254858 -> 1.293067: 1.03x slower
Avg: 1.336045 -> 1.365787: 1.02x slower
Significant (t=-3.30)
Stddev: 0.04851 -> 0.04135: 1.1730x smaller

### json_dump_v2 ###
Min: 17.871819 -> 16.968647: 1.05x faster
Avg: 18.428747 -> 17.483397: 1.05x faster
Significant (t=4.10)
Stddev: 1.60617 -> 0.27655: 5.8078x smaller

### mako ###
Min: 0.241614 -> 0.231678: 1.04x faster
Avg: 0.253730 -> 0.240585: 1.05x faster
Significant (t=8.93)
Stddev: 0.01912 -> 0.01327: 1.4417x smaller

### mako_v2 ###
Min: 0.225664 -> 0.213179: 1.06x faster
Avg: 0.234850 -> 0.225984: 1.04x faster
Significant (t=10.12)
Stddev: 0.01379 -> 0.01391: 1.0090x larger

### meteor_contest ###
Min: 0.777612 -> 0.758924: 1.02x faster
Avg: 0.799580 -> 0.780897: 1.02x faster
Significant (t=3.97)
Stddev: 0.02482 -> 0.02212: 1.1221x smaller

### nbody ###
Min: 0.969724 -> 0.883935: 1.10x faster
Avg: 0.996416 -> 0.918375: 1.08x faster
Significant (t=12.65)
Stddev: 0.02426 -> 0.03627: 1.4951x larger

### nqueens ###
Min: 1.142745 -> 1.128195: 1.01x faster
Avg: 1.296659 -> 1.162443: 1.12x faster
Significant (t=2.75)
Stddev: 0.34462 -> 0.02680: 12.8578x smaller

### pickle_dict ###
Min: 1.433264 -> 1.467394: 1.02x slower
Avg: 1.468122 -> 1.506908: 1.03x slower
Significant (t=-7.20)
Stddev: 0.02695 -> 0.02691: 1.0013x smaller

### raytrace ###
Min: 5.454853 -> 5.538799: 1.02x slower
Avg: 5.530943 -> 5.676983: 1.03x slower
Significant (t=-8.64)
Stddev: 0.05152 -> 0.10791: 2.0947x larger

### regex_effbot ###
Min: 0.205875 -> 0.194776: 1.06x faster
Avg: 0.211118 -> 0.198759: 1.06x faster
Significant (t=5.10)
Stddev: 0.01305 -> 0.01112: 1.1736x smaller

### regex_v8 ###
Min: 0.141628 -> 0.133819: 1.06x faster
Avg: 0.147024 -> 0.140053: 1.05x faster
Significant (t=2.72)
Stddev: 0.01163 -> 0.01388: 1.1933x larger

### richards ###
Min: 0.734472 -> 0.727501: 1.01x faster
Avg: 0.760795 -> 0.743484: 1.02x faster
Significant (t=3.50)
Stddev: 0.02778 -> 0.02127: 1.3061x smaller

### silent_logging ###
Min: 0.344678 -> 0.336087: 1.03x faster
Avg: 0.357982 -> 0.347361: 1.03x faster
Significant (t=2.76)
Stddev: 0.01992 -> 0.01852: 1.0755x smaller

### simple_logging ###
Min: 1.104831 -> 1.072921: 1.03x faster
Avg: 1.146844 -> 1.117068: 1.03x faster
Significant (t=4.02)
Stddev: 0.03552 -> 0.03848: 1.0833x larger

### spectral_norm ###
Min: 1.710336 -> 1.688910: 1.01x faster
Avg: 1.872578 -> 1.738698: 1.08x faster
Significant (t=2.35)
Stddev: 0.40095 -> 0.03331: 12.0356x smaller

### tornado_http ###
Min: 0.849374 -> 0.852209: 1.00x slower
Avg: 0.955472 -> 0.916075: 1.04x faster
Significant (t=4.82)
Stddev: 0.07059 -> 0.04119: 1.7139x smaller

### unpack_sequence ###
Min: 0.000030 -> 0.000020: 1.52x faster
Avg: 0.000164 -> 0.000174: 1.06x slower
Significant (t=-13.11)
Stddev: 0.00011 -> 0.00013: 1.2256x larger

### unpickle_list ###
Min: 1.333952 -> 1.212805: 1.10x faster
Avg: 1.373228 -> 1.266677: 1.08x faster
Significant (t=16.32)
Stddev: 0.02894 -> 0.03597: 1.2428x larger