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pybench results on dict_version-8.patch with CPU isolation: http://haypo-notes.readthedocs.org/microbenchmark.html
As usual, I'm very skeptical on the pybench results which almost look like noise. I don't understand how my change can make any operation *faster*, whereas some benchmarks are faster with the patch...
Dict microbenchmarks:
 DictCreation: 38ms 36ms +4.8% 39ms 37ms +3.9%
 DictWithFloatKeys: 40ms 40ms -0.8% 40ms 40ms -0.4%
 DictWithIntegerKeys: 33ms 31ms +7.2% 33ms 31ms +7.6%
 DictWithStringKeys: 29ms 28ms +0.4% 29ms 29ms +0.7%
 SimpleDictManipulation: 59ms 59ms -0.4% 59ms 59ms -0.4%
Full output:
$ ./python.version Tools/pybench/pybench.py -f pybench.version
$ ./python.orig Tools/pybench/pybench.py -f pybench.orig
$ ./python.orig Tools/pybench/pybench.py -s pybench.version -c pybench.orig 
-------------------------------------------------------------------------------
PYBENCH 2.1
-------------------------------------------------------------------------------
* using CPython 3.6.0a0 (default:e281a57d5b29, Apr 19 2016, 12:30:36) [GCC 5.3.1 20151207 (Red Hat 5.3.1-2)]
* disabled garbage collection
* system check interval set to maximum: 2147483647
* using timer: time.perf_counter
* timer: resolution=1e-09, implementation=clock_gettime(CLOCK_MONOTONIC)
-------------------------------------------------------------------------------
Benchmark: pybench.version
-------------------------------------------------------------------------------
 Rounds: 10
 Warp: 10
 Timer: time.perf_counter
 Machine Details:
 Platform ID: Linux-4.4.4-301.fc23.x86_64-x86_64-with-fedora-23-Twenty_Three
 Processor: x86_64
 
 Python:
 Implementation: CPython
 Executable: /home/haypo/prog/python/default/python.version
 Version: 3.6.0a0
 Compiler: GCC 5.3.1 20151207 (Red Hat 5.3.1-2)
 Bits: 64bit
 Build: Apr 19 2016 12:29:16 (#default:e281a57d5b29+)
 Unicode: UCS4
-------------------------------------------------------------------------------
Comparing with: pybench.orig
-------------------------------------------------------------------------------
 Rounds: 10
 Warp: 10
 Timer: time.perf_counter
 Machine Details:
 Platform ID: Linux-4.4.4-301.fc23.x86_64-x86_64-with-fedora-23-Twenty_Three
 Processor: x86_64
 
 Python:
 Implementation: CPython
 Executable: /home/haypo/prog/python/default/python.orig
 Version: 3.6.0a0
 Compiler: GCC 5.3.1 20151207 (Red Hat 5.3.1-2)
 Bits: 64bit
 Build: Apr 19 2016 12:30:36 (#default:e281a57d5b29)
 Unicode: UCS4
Test minimum run-time average run-time
 this other diff this other diff
-------------------------------------------------------------------------------
 BuiltinFunctionCalls: 49ms 50ms -1.3% 49ms 50ms -1.2%
 BuiltinMethodLookup: 26ms 26ms -0.8% 26ms 27ms -1.2%
 CompareFloats: 29ms 30ms -2.0% 29ms 30ms -1.9%
 CompareFloatsIntegers: 39ms 39ms +1.4% 39ms 39ms +1.5%
 CompareIntegers: 43ms 43ms -1.1% 43ms 43ms -1.1%
 CompareInternedStrings: 28ms 28ms -0.2% 28ms 28ms -0.3%
 CompareLongs: 25ms 25ms +2.8% 25ms 25ms +2.9%
 CompareStrings: 26ms 27ms -0.8% 26ms 27ms -1.6%
 ComplexPythonFunctionCalls: 44ms 44ms -1.6% 44ms 45ms -1.6%
 ConcatStrings: 35ms 33ms +6.4% 35ms 33ms +6.1%
 CreateInstances: 49ms 48ms +2.6% 50ms 49ms +1.8%
 CreateNewInstances: 37ms 36ms +2.5% 37ms 36ms +2.2%
 CreateStringsWithConcat: 65ms 63ms +3.3% 66ms 64ms +2.9%
 DictCreation: 38ms 36ms +4.8% 39ms 37ms +3.9%
 DictWithFloatKeys: 40ms 40ms -0.8% 40ms 40ms -0.4%
 DictWithIntegerKeys: 33ms 31ms +7.2% 33ms 31ms +7.6%
 DictWithStringKeys: 29ms 28ms +0.4% 29ms 29ms +0.7%
 ForLoops: 25ms 25ms -0.4% 26ms 26ms -0.3%
 IfThenElse: 37ms 35ms +3.3% 37ms 36ms +3.0%
 ListSlicing: 39ms 38ms +0.3% 39ms 39ms +0.0%
 NestedForLoops: 40ms 40ms +0.1% 40ms 40ms -0.0%
 NestedListComprehensions: 41ms 42ms -0.2% 42ms 42ms -0.9%
 NormalClassAttribute: 82ms 78ms +4.0% 82ms 79ms +3.8%
 NormalInstanceAttribute: 43ms 42ms +1.9% 44ms 43ms +1.8%
 PythonFunctionCalls: 40ms 42ms -5.0% 41ms 43ms -4.8%
 PythonMethodCalls: 51ms 52ms -1.1% 51ms 52ms -0.8%
 Recursion: 69ms 72ms -4.8% 69ms 73ms -4.7%
 SecondImport: 37ms 38ms -0.1% 37ms 38ms -0.1%
 SecondPackageImport: 40ms 39ms +1.9% 40ms 39ms +1.6%
 SecondSubmoduleImport: 96ms 97ms -1.0% 96ms 97ms -1.1%
 SimpleComplexArithmetic: 28ms 27ms +1.7% 29ms 28ms +1.9%
 SimpleDictManipulation: 59ms 59ms -0.4% 59ms 59ms -0.4%
 SimpleFloatArithmetic: 27ms 27ms +2.2% 27ms 27ms +2.3%
 SimpleIntFloatArithmetic: 31ms 31ms +1.6% 31ms 31ms +1.7%
 SimpleIntegerArithmetic: 31ms 31ms +0.8% 31ms 31ms +0.5%
 SimpleListComprehensions: 33ms 33ms +0.2% 33ms 33ms +0.4%
 SimpleListManipulation: 31ms 31ms -0.0% 32ms 32ms -1.5%
 SimpleLongArithmetic: 21ms 22ms -2.5% 22ms 22ms -1.8%
 SmallLists: 43ms 44ms -3.3% 43ms 44ms -3.5%
 SmallTuples: 51ms 53ms -2.9% 52ms 54ms -3.6%
 SpecialClassAttribute: 80ms 81ms -1.0% 80ms 81ms -1.1%
 SpecialInstanceAttribute: 42ms 42ms -0.5% 42ms 42ms -0.7%
 StringMappings: 87ms 86ms +0.8% 87ms 86ms +0.9%
 StringPredicates: 53ms 53ms +0.3% 53ms 53ms +0.2%
 StringSlicing: 48ms 49ms -1.3% 48ms 49ms -0.8%
 TryExcept: 25ms 25ms +0.6% 25ms 25ms +0.7%
 TryFinally: 35ms 35ms +1.1% 36ms 35ms +0.7%
 TryRaiseExcept: 13ms 13ms -0.5% 13ms 13ms -0.6%
 TupleSlicing: 46ms 46ms +0.2% 48ms 50ms -3.2%
 WithFinally: 54ms 53ms +0.8% 54ms 54ms +0.7%
 WithRaiseExcept: 44ms 43ms +2.8% 44ms 43ms +2.7%
-------------------------------------------------------------------------------
Totals: 2156ms 2150ms +0.3% 2171ms 2169ms +0.1%
(this=pybench.version, other=pybench.orig)