I want a replacement of OS (linux) Tried ipensuse 11.4 and ubuntu 11.4 i dont like them any advice 3D work?

I do not think I have ever seen someone want to use Linux for Graphic and "3D" work. Usually you would be working with adobe photoshop or you would be working on a MAC, not linux. The fact that you even mentioned backtrack is ridiculous. Backtrack is for security testing. The only other linux that I could recommend is a version called sabayon. Ubuntu is probably the most user friendly, but for some reason, you are saying that its slow? hmmm. Don't know what to tell you on that one. Then of course you should decide if you want a KDE or GNOME environment. I prefer KDE but that is my preference.