Hello, Again and again, it bothers me that if I write a simple program that I eg any large number i calculated, I always use only one thread. But I want to use ALL! If I then search the Internet for a solution I hit on constantly OpenMP! I've tried, but somehow I do not get this implemented properly. Often it comes down to "Critical sections"! Is there perhaps an alternative with which I, for example, can also speed up court? And why can one not set in Visual Studio, how many cores the program can claim up?