Icon Composer and Xcode building time

Question

Created 2w

Replies 3

Boosts 0

Participants 3

Hi everyone,
I’ve run into a strange issue while building my app with Xcode 26 beta 6 (targeting iOS 26). When I include an app icon created using Icon Composer, the build time jumps to over 5 minutes. During this time, I noticed that a utility called AssetCatalogSimulatorAgent is consuming a significant amount of CPU.

If I remove the Icon Composer-generated icon from my target, the build completes in about 40 seconds. This behavior is consistent across multiple builds.

Has anyone else experienced this? Is there a known workaround or optimization for icons created with Icon Composer? I’d love to keep using the new icon format, but the build time is becoming a real bottleneck.

Thanks in advance!

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Answer 1

joekw OP

1w

I'm seeing the same thing. 4 minutes for a build and 400% CPU usage with AssetCatalogSimulatorAgent.

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Answer 2

Glazier OP

1w

Ah, that's frustrating.

It would be helpful if you could file a feedback with a CPU sample of AssetCatalogSimulatorAgent

You can get a CPU sample either from activity monitor, or by running this in the terminal just before building.

sample AssetCatalogSimulatorAgent 120 -wait

Does the performance of the build change if you remove all of the groups and layers from the icon?

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Answer 3

asclepix OP

1w

I ran some more tests.

Removing all groups and layers made the process as fast as it was without the Icon Composer icon.
Simplifying the .svg files slightly increased the speed (3.5 minutes instead of 5 minutes).
Using .png files instead of .svg gave me the same results (3.5 minutes).

In fact, I was using four groups with one layer each.
Using only two groups (the first with one layer and the second with three), I managed to compile in 2 minutes and 15 seconds (using the simplified .svg files).

@Glazier Sincerely, I don't know how to extract useful information about this issue from the sample utility output. Can you give me some tips?

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