# Worse runtimes in Julia v1.12

**URL:** https://discourse.julialang.org/t/worse-runtimes-in-julia-v1-12/133231
**Category:** Performance
**Tags:** performance, release
**Created:** [October 17, 2025, 8:54am UTC](https://discourse.julialang.org/t/worse-runtimes-in-julia-v1-12/133231 "2025-10-17T08:54:39Z")
**Posts on this page:** 1
**Showing post:** 10

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### Author: ![mbauman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mbauman/32/31082_2.png) [@mbauman](https://discourse.julialang.org/u/mbauman)
#### Post date: [October 17, 2025, 4:59pm UTC](https://discourse.julialang.org/t/worse-runtimes-in-julia-v1-12/133231/10 "2025-10-17T16:59:04Z")

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The CI wall-time is surely a mix of [Startup time of 1000 packages – 53% slower in Julia 1.12 vs 1.10 - #81 by ufechner7](https://discourse.julialang.org/t/startup-time-of-1000-packages-53-slower-in-julia-1-12-vs-1-10/128343/81) (where you’re already participating) and runtime.

The most valuable thing here are concrete and isolated cases. Let’s focus this on those concrete examples where you can isolate a _runtime_ regression.

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_[View the full topic](https://discourse.julialang.org/t/worse-runtimes-in-julia-v1-12/133231)._