Gaps in Xcode build timeline

Reposting (after a while) from the Swift forums - the build timeline for our project has a lot of weird gaps in the beginning - almost 15 seconds in total, which is quite a big chunk of the total build time. Is there any way to determine why they exist or how I could fix them? I hope it's just something hidden and not the build system literally doing nothing...

This is on Xcode 15.4.

Hi @Aurelian! Did you manage to understand what that gaps meant? I'm analysing my project and I'm finding exactly same kind of gaps and have no clue how to fix them...