MSCORLIB.DLL 40%...is that normal? threadproblem?

I have been running a profiling with a windows application (C#) with 3-4 threads.
After running a profiling I notice mscorlib.dll has 40%, and if I expand it dotTrace shows System.Theading.ThreadHelp.ThreadStart() and System.Threading.Threadhelper..ccto(). It is normal with so large percentage for mscorlib.dll? I know one the of other threads takes a long time to execute, and that is using over 20%. Can it be a thread-problem? We are anyway thinking about rewriting this logic to get rid of this thread taking 20%, I don't know if the mscorlib.dll time consumption is related to that...

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