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Hi. when I try to build kmp app from Xcode with Product &gt; Archive it takes too much time, like 30 mins or more. in Activity Monitor I see only one java process using only one cpu core at 100%. Any way to speed the build? I would expect it to use more CPU just like when compiling on Android

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Hi! Archiving is always a slow process because it uses a clean build and release configuration. It also depends on the Mac config you're working on.

Could you please share a full build log to take a look on it?

I asked about the same thing a while ago, it seems that the native compiler is single threaded only, which is a huge bottleneck.

<https://youtrack.jetbrains.com/issue/KT-49379/Kotlin-Native-Is-there-a-way-to-improve-clang-performance#focus=Comments-27-5467487.0-0>

Screenshot 2025-03-08 at 19.55.19.png

Build iosApp_2025-03-06T23-51-14.txt

I'd say iOS support should not be marked as beta until issues such as these are resolved. And until Swift direct interop is a thing.

&gt; it took 4 hours on M1 Mac
Wow, that's scary. Unfortunately with no timecodes it's hard to say what was wrong there. I can see that project has lots of iOS dependencies, and there is very little about kotlin compilation itself.
To say more I have to see kotlin library build task log (with time code if it's possible).

Screenshot 2025-03-09 at 14.09.18.png

where are kotlin library build task logs? regarding dependencies, not sure if it is a lot but here is the pic. Im using Apple and Google login, also Crashlytics which require those deps

Screenshot 2025-03-09 at 14.12.54.png

not much Swift in project. 99.9% is Kotlin. Also hard to say when this happened exactly, for few months I neglected iOS and have not even opened Xcode :D

<https://developer.apple.com/documentation/xcode/improving-the-speed-of-incremental-builds>

To check Kotlin part, you probably need something like:
• clear build cache
• ./gradlew linkReleaseFrameworkIosArm64
But you also have to use some tool to analyze the build time.

Screenshot 2025-03-10 at 20.37.19.png

Screenshot 2025-03-10 at 20.37.39.png

forgot to clear cache. Anyway this seems to have exactly same behavior. at first it started at 200 cpu usage, now it's no more than 100

&gt; But you also have to use some tool to analyze the build time.
could you give more info here? I don't know any tool that will help here

Screenshot 2025-03-10 at 23.16.46.png

Are you using Kotlin 2.1.20-RC2 ? It might be the issue.
<https://youtrack.jetbrains.com/issue/CMP-7747>

You can try 2.1.20-RC, but it has some problems with backward compatibility of Kotlin libraries.

yep, otherwise my app crashes on startup...