# 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:** 4

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### Author: ![xiaodai](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/xiaodai/32/15937_2.png) [@xiaodai](https://discourse.julialang.org/u/xiaodai)
#### Post date: [October 12, 2018, 10:41am UTC](https://discourse.julialang.org/t/dataframes-operation-scales-badly/16223/4 "2018-10-12T10:41:34Z")

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Dataframes group by are not ootimised. See [Group-by performance benchmarks and recommendations](https://discourse.julialang.org/t/group-by-performance-benchmarks-and-recommendations/9313) for some background

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