Hi Jonas, welcome to the community 
Our dotnet analyzer is a Roslyn Analyzer that is invoked by Roslyn during the compilation. Apart from the additional warnings that are issued, the scan does not impact the final build. You can read more about how this works in The SonarSource guide for investigating the performance of .NET analysis.
Regarding a recommended approach, it’s currently not possible to use parallel processing because of this limitation. We are looking into ways that we can enable tests to be run in parallel, is this something that would help you?
I hope that helps
Tom