As Thierry stated, DirectX runs best with Windows. I had a Windows Vista computer with a decent amount of RAM and a graphics card. FeralHeart would run, but sometimes it would lag so bad I was fearful my computer was going to crash. It was impossible to have my browser open at the same time FeralHeart was. Like I said, my graphics card would work... But with all these new models coming out, my rating for it kept plummeting. After a new update for FeralHeart had been released, it demanded a better graphics card to run. I would recommend getting a better computer. If that's out of the question, try and see if you can get a new graphics card. If that's still impossible, try and fix any missing/outdated drivers. Scanning and getting rid of junk files can get rid of lag on your computer, which may give the computer better and more efficient ways to run. Then, FeralHeart will have more to work with. Oh jeez, sorry for the long post. I hope this could help a little. :L