How much does boot camp take speed from a macbook bro 15

Iam a architecture student and i need to buy a macbook for designing🙂, And some of the program's doesnt work on OS-X such as Revit unfortunately😟, And i need to know if it does effect to much on the speed, please if anybody knows help me!!!. If its possible how much does it take, 50% 30% of the general speed.😊