As my heading suggest which is the best programming language for creation of OS. My main motto is to create very interactive , high graphical support and very fast, OS . But I think c++ somehow decrease the performance of the vomputer. Actually its the fact that if we increase the appearance of the OS the performance is also decrease. So how i deal with that problem without upgrading the hardware to ultra , that means I want to make the OS which also work on the computers that has 4 gb ram and i3 or quite lower processor with great appearance and performance.