FLStudio for macOS was FLStudio 20 (May 2018)
You can download FLStudio for macOS and Windows from our FLStudio downloads page .
Purchasing FLStudio gives you a valid licence to use both macOS and Windows versions ...
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 11 on a i5 4GBRam laptop and had the problem, as my working style is quite chaotic and I use many instances of plugins and synths playing MIDI that when projects become bigger Flstudio starts lagging. And often ...