# @time vs @btime in docs

**URL:** <https://discourse.julialang.org/t/time-vs-btime-in-docs/97454>\
**Category:** Internals & Design\
**Created:** [April 13, 2023, 10:55pm UTC](https://discourse.julialang.org/t/time-vs-btime-in-docs/97454 "2023-04-13T22:55:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jar1](https://avatars.discourse-cdn.com/v4/letter/j/c0e974/32.png) [@jar1](https://discourse.julialang.org/u/jar1)\
**Post date:** [April 13, 2023, 10:55pm UTC](https://discourse.julialang.org/t/time-vs-btime-in-docs/97454/1 "2023-04-13T22:55:06Z")

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[Performance Tips · The Julia Language](https://docs.julialang.org/en/v1/manual/performance-tips/) says "Measure performance with `@time` " but whenever someone comes with a performance question on Discourse they’re always advised to use `@btime` instead. Should the docs be changed or not?

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**Author:** ![baggepinnen](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/baggepinnen/32/693_2.png) [@baggepinnen](https://discourse.julialang.org/u/baggepinnen)\
**Post date:** [April 14, 2023, 10:49am UTC](https://discourse.julialang.org/t/time-vs-btime-in-docs/97454/2 "2023-04-14T10:49:07Z")

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The docs also say

> Note: For more serious benchmarking, consider the BenchmarkTools.jl package which among other things evaluates the function multiple times in order to reduce noise.