Common platform:
CPU model: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz
SCM: hg revision=d3185be3e8d7+ tag=tip branch=default date="2013-04-08 22:43 +0200"
Timer info: namespace(adjustable=False, implementation='clock_gettime(CLOCK_MONOTONIC)', monotonic=True, resolution=1e-09)
Python unicode implementation: PEP 393
CFLAGS: -Wno-unused-result -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fno-builtin-memcmp
Bits: int=32, long=64, long long=64, size_t=64, void*=64
Timer: time.perf_counter
Platform: Linux-3.8.1-201.fc18.x86_64-x86_64-with-fedora-18-Spherical_Cow

Platform of campaign original:
Python version: 3.4.0a0 (default:d3185be3e8d7+, Apr 8 2013, 23:42:14) [GCC 4.7.2 20121109 (Red Hat 4.7.2-8)]
Timer precision: 40 ns
Date: 2013-04-08 23:42:14

Platform of campaign patched:
Python version: 3.4.0a0 (default:d3185be3e8d7+, Apr 8 2013, 23:25:58) [GCC 4.7.2 20121109 (Red Hat 4.7.2-8)]
Timer precision: 39 ns
Date: 2013-04-08 23:41:11

-----------------------+------------+-------------
Length 1               |   original |      patched
-----------------------+------------+-------------
hash('a' * 1)          |  76 ns (*) |  81 ns (+7%)
hash('\u20ac' * 1)     |  79 ns (*) |        80 ns
hash('\U0010ffff' * 1) |  76 ns (*) |  83 ns (+9%)
-----------------------+------------+-------------
Total                  | 231 ns (*) | 244 ns (+6%)
-----------------------+------------+-------------

-----------------------+------------+-------------
Length 3               |   original |      patched
-----------------------+------------+-------------
hash('a' * 3)          |  79 ns (*) |        83 ns
hash('\u20ac' * 3)     |  79 ns (*) |  86 ns (+8%)
hash('\U0010ffff' * 3) |  79 ns (*) |  85 ns (+7%)
-----------------------+------------+-------------
Total                  | 238 ns (*) | 253 ns (+6%)
-----------------------+------------+-------------

------------------------+------------+--------
Length 10               |   original | patched
------------------------+------------+--------
hash('a' * 10)          |  84 ns (*) |   83 ns
hash('\u20ac' * 10)     |  85 ns (*) |   85 ns
hash('\U0010ffff' * 10) |  85 ns (*) |   83 ns
------------------------+------------+--------
Total                   | 254 ns (*) |  251 ns
------------------------+------------+--------

------------------------+------------+-------------
Length 20               |   original |      patched
------------------------+------------+-------------
hash('a' * 20)          |  94 ns (*) |  86 ns (-8%)
hash('\u20ac' * 20)     |  92 ns (*) |  84 ns (-9%)
hash('\U0010ffff' * 20) |  94 ns (*) |  86 ns (-8%)
------------------------+------------+-------------
Total                   | 280 ns (*) | 256 ns (-8%)
------------------------+------------+-------------

-------------------------+------------+--------------
Length 100               |   original |       patched
-------------------------+------------+--------------
hash('a' * 100)          | 175 ns (*) |  92 ns (-47%)
hash('\u20ac' * 100)     | 178 ns (*) | 102 ns (-43%)
hash('\U0010ffff' * 100) | 175 ns (*) | 127 ns (-27%)
-------------------------+------------+--------------
Total                    | 528 ns (*) | 321 ns (-39%)
-------------------------+------------+--------------

-----------------------------+-------------+---------------
Length 10 ** 4               |    original |        patched
-----------------------------+-------------+---------------
hash('a' * 10 ** 4)          | 10.7 us (*) |  1.4 us (-87%)
hash('\u20ac' * 10 ** 4)     | 10.7 us (*) | 2.73 us (-74%)
hash('\U0010ffff' * 10 ** 4) | 10.7 us (*) | 5.35 us (-50%)
-----------------------------+-------------+---------------
Total                        |   32 us (*) | 9.49 us (-70%)
-----------------------------+-------------+---------------

-----------------------------+------------+---------------
Length 10 ** 8               |   original |        patched
-----------------------------+------------+---------------
hash('a' * 10 ** 8)          | 108 ms (*) | 14.7 ms (-86%)
hash('\u20ac' * 10 ** 8)     | 109 ms (*) | 29.7 ms (-73%)
hash('\U0010ffff' * 10 ** 8) | 112 ms (*) | 59.6 ms (-47%)
-----------------------------+------------+---------------
Total                        | 329 ms (*) |  104 ms (-68%)
-----------------------------+------------+---------------

---------------+------------+---------------
Summary        |   original |        patched
---------------+------------+---------------
Length 1       | 231 ns (*) |   244 ns (+6%)
Length 3       | 238 ns (*) |   253 ns (+6%)
Length 10      | 254 ns (*) |         251 ns
Length 20      | 280 ns (*) |   256 ns (-8%)
Length 100     | 528 ns (*) |  321 ns (-39%)
Length 10 ** 4 |  32 us (*) | 9.49 us (-70%)
Length 10 ** 8 | 329 ms (*) |  104 ms (-68%)
---------------+------------+---------------
Total          | 329 ms (*) |  104 ms (-68%)
---------------+------------+---------------