# Another slowdown when using \`Threads.@threads\`?

**URL:** <https://discourse.julialang.org/t/another-slowdown-when-using-threads-threads/78009>\
**Category:** General Usage\
**Tags:** performance\
**Created:** [March 17, 2022, 7:53am UTC](https://discourse.julialang.org/t/another-slowdown-when-using-threads-threads/78009 "2022-03-17T07:53:32Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![Oscar\_Smith](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/oscar_smith/32/25343_2.png) [@Oscar\_Smith](https://discourse.julialang.org/u/Oscar_Smith)\
**Post date:** [March 17, 2022, 3:42pm UTC](https://discourse.julialang.org/t/another-slowdown-when-using-threads-threads/78009/3 "2022-03-17T15:42:25Z")

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polyester loses computability. base threads will be relatively intelligent if you nest threaded loops, but polyester will result in over-subscription.

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