Speed up builds for 0.68

[billnbell]

Description

I am seeing +20 min build more than 0.67 builds with 0.68.

Is this because AppDelegate.mm is slow? Is there anyway to speed it up?

Version

0.68.0

Output of npx react-native info

no..........

Steps to reproduce

A normal build. Xcode.

Snack, code example, screenshot, or link to a repository

No response

[supercollin]

I have the same problem on Android.

Build takes more than 20min and waits on gradle task:

Task :ReactAndroid:buildNdkBuildDebug

[brunoducattii]

I have the same problem as well.

[cortinico]

If on new architecture, that's expected as you're now compiling also native code.

The first build will be expensive, but subsequent builds are supposed to be faster.

Anyway, we've published a guide on how to mitigate this:
https://reactnative.dev/docs/build-speed

[raajnadar]

As per the docs if we use --active-arch-only flag should reduce the build time by a ~75% factor.

The build is still slow on my MacBook Pro (13-inch, 2019), 1.4 GHz Quad-Core Intel Core i5

[cortinico]

As per the docs if we use --active-arch-only flag should reduce the build time by a ~75% factor.
The build is still slow on my MacBook Pro (13-inch, 2019), 1.4 GHz Quad-Core Intel Core i5

The docs clearly says that the --active-arch-only flag is for Android only. How is this related to this issue @raajnadar which is about iOS?

[raajnadar]

I am running the android project on my Macbook, I just gave my laptop info to see if anyone with the same config has the same slow-building issue

I used yarn react-native run-android --active-arch-only cmd it took 20 min

[cortinico]

Please open a separate issue + specify if you're on New/Old architecture. As I mentioned before, on New Architecture an increase on build time is expected as you're building native code. Please follow the setup on reactnative.dev/docs/build-speed, configure ccache and report any issue you're having if any.