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.ix performance regression? #4198

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@wesm

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@wesm

is this kind of use cases reflected in our vbenchmarks? suppose @jreback is the one to ask here. more evidence need to rewrite the internals of pandas objects in C to reduce indexing overhead, among other things

http://stackoverflow.com/questions/17538902/is-there-a-way-to-speed-up-this-pandas-function

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    PerformanceMemory or execution speed performance

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