c# CompileAssemblyFromSource slower than Visual Studio

I've a simple class (600 lines) that I compiling by CompileAssemblyFromSource method.

This method take over than 1 minute to finish, I tried to compile the code directly in Visual Studio and it takes less than one second...

What's wrong? How can I speed up my dynamic compilation?

Thare are some options That I can try?

Thank you for your help.