# Ideas on compiler performance improvement? **URL:** \ **Category:** compiler\ **Created:** [May 24, 2018, 4:46am UTC](https://internals.rust-lang.org/t/ideas-on-compiler-performance-improvement/7633 "2018-05-24T04:46:03Z")\ **Posts on this page:** 3\ **Page:** 2
**Author:** ![rpjohnst](https://sea2.discourse-cdn.com/flex002/user_avatar/internals.rust-lang.org/rpjohnst/32/9524_2.png) [@rpjohnst](https://internals.rust-lang.org/u/rpjohnst)\ **Post date:** [June 1, 2018, 4:40pm UTC](https://internals.rust-lang.org/t/ideas-on-compiler-performance-improvement/7633/22 "2018-06-01T16:40:54Z")
You can set the number of code units to 1, and people often do that for release builds. But it doesn’t make things faster, it makes things slower—the the reason to split them up is to parallelize the LLVM stage. ---
**Author:** ![mark-i-m](https://sea2.discourse-cdn.com/flex002/user_avatar/internals.rust-lang.org/mark-i-m/32/3167_2.png) [@mark-i-m](https://internals.rust-lang.org/u/mark-i-m)\ **Post date:** [June 4, 2018, 4:12am UTC](https://internals.rust-lang.org/t/ideas-on-compiler-performance-improvement/7633/23 "2018-06-04T04:12:19Z")
Shameless plug: Is anyone interested in writing something up for [https://github.com/rust-lang-nursery/rustc-guide/issues/88](https://github.com/rust-lang-nursery/rustc-guide/issues/88)? ---
**Author:** ![system](https://sea2.discourse-cdn.com/flex002/user_avatar/internals.rust-lang.org/system/32/14092_2.png) [@system](https://internals.rust-lang.org/u/system)\ **Post date:** [March 25, 2019, 8:30am UTC](https://internals.rust-lang.org/t/ideas-on-compiler-performance-improvement/7633/24 "2019-03-25T08:30:18Z")
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