# MacOS ARM64 no faster than emulated x86?

**URL:** <https://discourse.julialang.org/t/macos-arm64-no-faster-than-emulated-x86/72481>\
**Category:** Performance\
**Created:** [December 2, 2021, 6:17pm UTC](https://discourse.julialang.org/t/macos-arm64-no-faster-than-emulated-x86/72481 "2021-12-02T18:17:55Z")\
**Posts on this page:** 1\
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**Author:** ![gbaraldi](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/gbaraldi/32/22101_2.png) [@gbaraldi](https://discourse.julialang.org/u/gbaraldi)\
**Post date:** [December 2, 2021, 9:04pm UTC](https://discourse.julialang.org/t/macos-arm64-no-faster-than-emulated-x86/72481/8 "2021-12-02T21:04:18Z")

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This is probably memory bound, and the memory bandwith while in rosetta is probably very similar to native. There are also some things that are a lot slower on native than on rosetta, probably cause llvm codegen isn’t as good for aarch64 for that specific case.  
Example here [Very different performance on M1 mac, native vs rosetta](https://discourse.julialang.org/t/very-different-performance-on-m1-mac-native-vs-rosetta/66845)

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