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 project runs at 15% CPU automatically. No vsts open at all, just some parametric EQ's and Limiters in my custom Template.
2. Any FL project with 4 or more VST's running hits 80-99% CPU and spikes ...