# Performance gain of building Julia from source

**URL:** <https://discourse.julialang.org/t/performance-gain-of-building-julia-from-source/139894>\
**Category:** Performance\
**Tags:** build\
**Created:** [October 8, 2026, 1:27am UTC](https://discourse.julialang.org/t/performance-gain-of-building-julia-from-source/139894 "2026-10-08T01:27:25Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![pekuntzpuglia](https://avatars.discourse-cdn.com/v4/letter/p/3d9bf3/32.png) [@pekuntzpuglia](https://discourse.julialang.org/u/pekuntzpuglia)\
**Post date:** [October 8, 2026, 1:27am UTC](https://discourse.julialang.org/t/performance-gain-of-building-julia-from-source/139894/1 "2026-10-08T01:27:25Z")

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Is there any concrete performance gain from building Julia from source locally? If yes, does anyone have ballparks for expected speedup and tips for navigating Julia’s `Make.inc` with performance-oriented options?

I have noticed building from source automatically sets `MARCH` to `native`, which should provide a speedup compared to juliaup’s installation.

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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:** [October 8, 2026, 2:27am UTC](https://discourse.julialang.org/t/performance-gain-of-building-julia-from-source/139894/2 "2026-10-08T02:27:44Z")

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The speedup is very minor because Julia already multi versions (e.g. x86 has levels for generic, nehalem, haswell, and Skylake iirc). Also, Julia will JIT code based on your specific CPU, so anything we lose is only lost for methods in the sysimage

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**Author:** ![Keno](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/keno/32/285_2.png) [@Keno](https://discourse.julialang.org/u/Keno)\
**Post date:** [October 8, 2026, 2:28am UTC](https://discourse.julialang.org/t/performance-gain-of-building-julia-from-source/139894/3 "2026-10-08T02:28:33Z")

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Also, we may start PGO’ing the official builds soon, which is annoying to do locally, so the official builds may end up faster.