Cloud Build taking long. Is unity compiling multiple times for on single target?

Our cloud build times are taking one hour for a fairly simple project and I am having problems figuring out why. I read an articles(*) about it but nothing explains this issue. The build log is the only tool I have found to profile with.

Based on the build log checkout time is OK.

One odd thing I saw was that it complained about the same C# compilation warnings exactly 10 times. It looks like it is compiling it 10 times which is odd to me as we are only using one target(ios-default).

Is unity compiling the same C# code multiple times for on single target?

*) https://support.unity3d.com/hc/en-u...my-build-times-on-Cloud-Build-taking-so-long-

(PS. We are also having odd issues with compiling shader variants but I post about it in a separate thread.)