# DataFrames operation scales badly

**URL:** <https://discourse.julialang.org/t/dataframes-operation-scales-badly/16223>\
**Category:** Performance\
**Created:** [October 12, 2018, 9:17am UTC](https://discourse.julialang.org/t/dataframes-operation-scales-badly/16223 "2018-10-12T09:17:35Z")\
**Posts on this page:** 1\
**Showing post:** 20

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**Author:** ![piever](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/piever/32/1815_2.png) [@piever](https://discourse.julialang.org/u/piever)\
**Post date:** [October 13, 2018, 7:39pm UTC](https://discourse.julialang.org/t/dataframes-operation-scales-badly/16223/20 "2018-10-13T19:39:44Z")

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If you have a limited set of strings that are repeated very often, you could probably use [CategoricalArrays](https://github.com/JuliaData/CategoricalArrays.jl) which gives you an automated way of doing what you suggest (you don’t need to manually perform any replacement).

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