# Initializing an array of mutable objects is surprisingly slow

**URL:** https://discourse.julialang.org/t/initializing-an-array-of-mutable-objects-is-surprisingly-slow/11780
**Category:** Performance
**Tags:** performance
**Created:** [June 19, 2018, 11:40am UTC](https://discourse.julialang.org/t/initializing-an-array-of-mutable-objects-is-surprisingly-slow/11780 "2018-06-19T11:40:30Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![cnliao](https://avatars.discourse-cdn.com/v4/letter/c/ce73a5/32.png) [@cnliao](https://discourse.julialang.org/u/cnliao)
#### Post date: [June 19, 2018, 3:44pm UTC](https://discourse.julialang.org/t/initializing-an-array-of-mutable-objects-is-surprisingly-slow/11780/6 "2018-06-19T15:44:13Z")

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I just found [this issure (#21912)](https://github.com/JuliaLang/julia/pull/21912), indicating that mutating an immutable probably will become a feature.

For my use case, I can live with a mutable wrapper l mentioned above. Maybe save some typing with a macro. Still interested to see if you have alternative solutions 😉

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