FLStudio on the installer download page
If your system meets the minimum system requirements your actual system resources (memory, CPU speed) that will impose limits on your FLStudio projects. See here for more information on choosing good PC for FL ...
FLStudio 12.
Even though I have a 2.7ghz i5, I still am using a lot of CPU (up to 80% according to FL) on even more basic projects. I did not experience this with previous computers that weren ...