Urf

I've been stuck in Blenderland for years now. Just recently have I explored the "other" software packages to help me fulfill my graphical needs. WOW this package looks amazing. My question is I use both Windows 8.1 64 bit and Linux Mint 64 bit for various things. If I make a purchase I see that I am entitled to use this software on multiple machines but is this for the same OS or once I make a purchase I can download it for both and switch back and forth when needed? My other question is performance related. Blender usability is identical between Windows and Linux but Linux offers me a very noticable improvement in speed of rendering etc. If I can only use this application in one OS which one gives the best performance boost. I do have a Cuda card and have both systems configured for its use if that makes a difference. Thank you for your time. PS. Si Bennett from YouTube is a rockstar salesman for your product. If it wasn't for him I may have overlooked this hidden gem.