# Poor performance while multithreading (Julia 1.0)

**URL:** https://discourse.julialang.org/t/poor-performance-while-multithreading-julia-1-0/20325
**Category:** Performance
**Tags:** multithreading
**Created:** [January 31, 2019, 5:14pm UTC](https://discourse.julialang.org/t/poor-performance-while-multithreading-julia-1-0/20325 "2019-01-31T17:14:02Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![rdeits](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rdeits/32/286_2.png) [@rdeits](https://discourse.julialang.org/u/rdeits)
#### Post date: [January 31, 2019, 6:07pm UTC](https://discourse.julialang.org/t/poor-performance-while-multithreading-julia-1-0/20325/4 "2019-01-31T18:07:07Z")

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Are you perhaps running into the dreaded issue [15276](https://github.com/JuliaLang/julia/issues/15276)? That issue in particular has been known to cause performance issues due to the closures created by the `@threads` macro (e.g. [Slowdown when multi-threading is used](https://discourse.julialang.org/t/slowdown-when-multi-threading-is-used/1149) or [Type inference for parallel computing](https://discourse.julialang.org/t/type-inference-for-parallel-computing/8122) or [`@threads` with `@simd` performance regression on `0.7.0-alpha` - #2 by raminammour](https://discourse.julialang.org/t/threads-with-simd-performance-regression-on-0-7-0-alpha/11297/2) )

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